I haven’t used either of these firms, but I did do a web search a few month’s back. I spoke with Clive at Custom Anodising and he came across as a good bloke. I was thinking about having a frame anodised at the time. Good luck.
I found a chap who was able to anodise my frame linkages, he did the lot considerably cheaper than any anodising companies I could find (who all wanted a minimum order price). Not sure he’d want me putting his email on the forum, but if someone wants his contact details – drop me a message.