Is it a Rockets race jacket?
According to 1986 Speedway Yearbook the Rye House Select side contained Andrew Silver, Ali Stevens, Bob Garrad and Rob Parish... I have the programme somewhere in the garage amongst countless others... At a guess I'd say it was Andrew Silver's race jacket... He rode at number 1 for the Rockets in 1985.
Just for those fellow anoraks out there (Rye House unless stated)... Rye House Select 28 (Andrew Silver 4-9; Ali Stevens 4-7; Bob Garrad 4-6; Rob Parish, Mildenhall 4-6); Poole Select 30 (Kevin Smith 4-11; Rob Henry, Mildenhall 4-9; Neil Middleditch, Arena Essex, 4-9; Russell Paine, Arena Essex, 4-1); Kent Select 22 (Barry Thomas, Hackney, 4-8; Rob Tilbury, Canterbury, 4-6; Andy Galvin, Hackney, 4-4; Peter Johns, Wimbledon, 4-4); Kings Lynn Select 16 (Martin Goodwin, Arena Essex, 4-8; Bob Humphries, Arena Essex, 4-4; Kelvin Mullarkey 4-3; Gary Rolls 4-1).