chemical etching/milling

I was hoping someone could point me in the right direction with regards to
chemical etching/milling?

I have all the equipment for screen printing and while I currently use
mesh
I would like to use brass/stainless sheets.

I know its not as detailed as laser cutting but it would allow me to do it
with little additional cost.

Also - I would need a supplier to both the etching chemicals as well as
the
resist material here in the UK

Thanks.