UCL is looking to run its Welsh course again this year. I’ve done it for 3 terms, and got a lot out of it. It’s been on Wednesdays at 6 or 7pm for 2 hours (often with a drink afterwards to practice talking). It’s a very small group - 3 people last year - so you get lots of individual support. The tutor, Siarl, is lovely and really helpful - will tailor the course to your needs. He’s a linguist, so there’s lots of grammar, but in a demystifying and practical way.
Here’s the link to register: http://www.ucl.ac.uk/clie/evening-courses/register_online
If you want Siarl’s email, pm me yours and I’ll put you in touch.
