BA fasteners

Hi everyone, I've recently returned to the joy of restoring valve radios after a very long gap. When I started (in the 1980's) it was still relatively easy to source BA fasteners (which as I recall were more prevalent than metric equivalents). I'm finishing up an old Bush DAC 10 and sadly I'm short a few screws - and pretty much all my "stock" is metric. Does anyone know where I can source some fasteners locally (I guess a mix of 8/6/4BA)? Seems easier if I was in the UK!

Cheers
Bruce