if you want to touch it up cheaply on the welded part then take the frame into B&Q and they can scan the yellow. Buy a tester pot of mixed paint for about a 5er and then just lacquer the repair with something like a brushed on modelling laquer - the valspar paint or whatever they call it isnt resistant or hard like an enamel etc so it needs a protective coat but it would hide the repair from afar. Im not sure who else do a cheap colour matching service. Otherwise it could be buying a few pots of humbrol and mixing it by eye? Id leave the rest of the frame as it.
if you want to touch it up cheaply on the welded part then take the frame into B&Q and they can scan the yellow. Buy a tester pot of mixed paint for about a 5er and then just lacquer the repair with something like a brushed on modelling laquer - the valspar paint or whatever they call it isnt resistant or hard like an enamel etc so it needs a protective coat but it would hide the repair from afar. Im not sure who else do a cheap colour matching service. Otherwise it could be buying a few pots of humbrol and mixing it by eye? Id leave the rest of the frame as it.