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You will need to following components to complete the body from N Brass Components;
23148 Smokebox door
23017 Safety valve
23058 Vacuum pipes
23280 Handrail knobs
This is advisory only as you may wish to find other components to match different variations of the class.
You will also need a Graham Farish 4F loco chassis (latest model) and the tender from a Graham Farish SECR N class to complete. Some filing of the chassis block will be necessary to fit the body.