Three British arms facilities prodiced No. 4 and No. 5 rifles: Maltby, Shirley and Fazakerly.
Sorry to be a nit picker, but as a picker of nits, Maltby only made No4 rifles. The No5 was a BSA and Faz only rifle.
ROF Maltby produced the highest number of Brit made No4's. Not know for the finish but they are know for a proper, good shooting rifle. Faz is know for the amount of A suffix rifles(non standard part(s)) BSA produced some of the best No4's IMHO.