I can add some more, but currently incomplete information. The ease of panel changes makes it hard to be sure of original colours and I can point to a Heidelberg car wearing some Slough panels.
192004806 1962> & <9/1964 White with white roof, Blue/Green trim 6759 2224326
19621520 Blue/Grey, white roof, Red trim 6644 2224323
19114169 1961? White body, roof missing Red/white trim 6044 224318
19627676 White body, white roof, 6389 2224618
192004806 1962> & <9/1964 White with white roof, Blue/Green trim 6759 2224326
19621520 Blue/Grey, white roof, Red trim 6644 2224323
19114169 1961? White body, roof missing Red/white trim 6044 224318
19627676 White body, white roof, 6389 2224618