Just done a google, and there's a few UK based C type replica manufacturers. Can't think they're off JLRs radar as it only took seconds to find at least three.

CJR Replicas
Nostalgia Cars
Proteus Cars

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10