Heat treatments shops in south london/surrey/sussex/kent?

[graffian]

I need to get a pair of EN36 shims cased, local place only does vacuum heat treatment.
I am near Gatwick airport. Anyone know of place near me?

I eventually bit the bullet and drove up to Walton, had just the couple of small items not much bigger than a tuppence, the bloke wanted 58 quid plus vat!