Rocket Precision motor and gearbox units were frequently used by those building 7mm scale 0 gauge locomotives during pre war days through to the 1940s and 50s, including G P Keen (well known modeller and former president of The Model Railway Club) for his well known K Lines railway. Rocket Precision is understood to have been formed by W S Norris.
Further details of motors including Leakey, Pittman, Read Maxwell, Rocket Precision and Romford are available at the excellent Milbro Model Railways site
 
Rocket Precision 12v DC Motor and Gearbox  | 
 
Rocket Precision 12v DC Motor and Gearbox  | 
 
Rocket Precision 12v DC Motor and Gearbox  | 

 
Rocket Precision Scaloh 7mm Insulators Clips and Spikes  | 

 
Rocket Precision Scaloh 7mm Dog Nails  | 
 
Rocket Precision Scaloh 7mm Dog Nails  | 
 
Rocket Precision Scaloh 7mm Dog Nails  | 

 
Rocket Precision Scaloh 7mm Track Keys  | 

 
Rocket Precision Scaloh 7mm 100 Slide On Chairs  | 

 
Rocket Precision Sleepers (Ties), 305 x 7 x 1.75mm  | 

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