Thanks Paul and Mick for your suggestions. Chasni does seem to be a bit of a hybrid, doesn't it? You've both mentioned tomato ketchup as an ingredient - maybe we should be developing a couple of new recipes that use Bovril, Branston Pickle,Picklelilly etc! I already use HP brown sauce in a rough-and-ready pakora dipping sauce! Thanks for your help guys, this should please the missus no end!
Cheers,
TheValveDoctor