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A retaining arrangement for joining together two components such as a rim coverplate 10 and a rotor disc 12 in a gas turbine engine. The arrangement comprising a channel 54 formed by respective formations 26, 52 on the disc 12 and coverplate 10, which channel 54 locates one or more annular ring memb

A retaining arrangement for joining together two components such as a rim coverplate 10 and a rotor disc 12 in a gas turbine engine. The arrangement comprising a channel 54 formed by respective formations 26, 52 on the disc 12 and coverplate 10, which channel 54 locates one or more annular ring member 66 which prevents relative axial movement therebetween. Engageable abutment formations 18, 46 are provided respectively on the disc 12 and coverplate 10, to prevent relative pivotal movement.

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We claim: 1. A retaining arrangement for joining together two components, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, a radially inner slot and a radially outer

We claim: 1. A retaining arrangement for joining together two components, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, a radially inner slot and a radially outer slot which cooperate to define an annular channel, a ring member slidably locatable in said annular channel, said annular channel including at least one opening in order to provide access to the interior of said annular channel and said ring member, and a recess in at least one of said components to receive respective abutment formations on each component, which abutment formations are engageable, when the components are in said required relative position with the ring member in the channel, to prevent separation of the components wherein the outer surface of both components when joined is substantially flush in order to reduce windage effects during use. 2. An arrangement according to claim 1, in which the ring member has at least one break in its length. 3. An arrangement according to claim 1, in which a plurality of ring members are provided locatable coaxially adjacent each other in the channel. 4. An arrangement according to claim 1, in which the ring member is formed from a length of strip material, with greater radial than axial dimensions. 5. An arrangement according to claim 1, in which the opening in the annular channel is provided to permit the ring member to be threaded into the annular channel. 6. An arrangement according to claim 1, in which formations are provided adjacent an end of the ring member, and along the length thereof, to assist engagement with the ring member to permit sliding thereof through the channel. 7. An arrangement according to claim 1, in which the abutment formations are configured so as to when engaged, substantially prevent relative pivotal movement between the components. 8. A method of joining together two components, the method comprising using a retaining arrangement according to claim 1. 9. A method according to claim 8, in which a plurality of ring members of different thicknesses are provided, and at least one ring member of a required thickness is chosen to provide a required sliding fit in the channel. 10. A retaining arrangement for joining together two components with at least one of the components having a generally annular configuration, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, a radially inner slot and a radially outer slot which cooperate to define an annular channel substantially coaxial with said one component, a ring member slidably locatable in said annular channel, said annular channel including at least one opening in order to provide access to the interior of said annular channel and said ring member, and a recess in at least one of said components to receive respective abutment formations on each component, which abutment formations are engageable, when the components are in said required relative position with the ring member in the channel, to prevent separation of the components wherein the outer surface of both components when joined is substantially flush in order to reduce windage effects during use. 11. A retaining arrangement for joining together two components in a gas turbine engine, with at least one of the components having a generally annular configuration substantially coaxial with the engine axis, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, a radially inner slot and a radially outer slot which cooperate to define an annular channel substantially coaxial with said one component, a ring member slidably locatable in said annular channel, said annular channel including at least one opening in order to provide access to the interior of said annular channel and said ring member, and a recess in at least one of said components to receive respective abutment formations on each component, which abutment formations are engageable, when the components are in said required relative position with the ring member in the channel, to prevent separation of the components wherein the outer surface of both components when joined is substantially flush in order to reduce windage effects during use. 12. A retaining arrangement for joining together two components, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, to define an annular channel, a ring member slidably locatable in said annular channel, and respective abutment formations on each component, which abutment formations are engageable, when the components are in said required relative position with the ring member in the channel, to prevent separation of the components wherein the ring member has at least one break in its length and is formed in a plurality of sections along its length. 13. A retaining arrangement for joining together two components, the arrangement comprising respective channel forming formations on each component which are cooperable when the components are in a required relative position for joining together, to define an annular channel, a ring member slidably locatable in said annular channel, and respective abutment formations on each component, which abutment formations are engageable, when the components are in said required relative position with the ring member in the channel, to prevent separation of the components wherein an opening formation is provided in at least one of the components to provide an axial opening into the channel to permit a ring member to be threaded into the channel wherein a plurality of openings are provided, which openings are arranged diametrically opposite one another.