Savage produced more than 1.2 million No4 and No4 Mk1* rifles for the British during the period 1941-1944. As for any MILSURP, value depends on condition, originality of components and finish, matching bolt and rifle s/ns, all Savage parts, and demand. The Savage rifles are very well made.
All things being equal, Cdn No4 buyers will pay more for the home produced Longbranch rifles than the Savage or Brit made rifles. Sound Longbranches with matching bolt/receiver s/ns, original finish and LB parts in VG condition with sound bores seem to be selling for $500-$600 nowadays. A Savage in like shape would fetch maybe $100 less. Assessing condition is quite subjective, so photos would be helpful.