Prest_400
Multiformat
How much do you pay for processing in the UK? If you send your film abroad anyhow, you could as well send it to Eurocolor/Fuji in Gera, Germany. It's the official Fuji lab. They charge a modest € 1.95 (135) or €2.95 (120)/roll plus return postage (letter) and the quality is very good, so it is very good value.
Wow, sure those aren't legacy prices from 5+ years ago? Did a quick google and didn't see much E6 related.
In Spain, Interphoto lab which may be the only lab running dip and dunk in the country lists 8,25€ for 35mm and 7,50€ for 120.
For C41 I haven't seen dev only for less than 3,50 (can't recall where) being often around 4€. 35mm & 120 more or less priced equally.
Anyhow Germany does seem to be the country with a strong, if not strongest E6 network (Henning Serger praised slide and he was around often? long time no see). Spain doesn't seem to be in that bad situation lab wise.