Those will be competition cars going to or from an event Rich.
MS UK (formerly MSA) regs forbid display of numbers on a competition car when driven on the road (we're talking race/sprint/hill climb etc. here).

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW