Simplybook
Just visited Bimble and the guys there explained and sorted my ancient motorhome's solar arrangement and saved me money in the process - they could have taken much more off me but didn't, and that's priceless! Highly recommended.
Google
Fast service. Materials are expensive for what they are but Bimble solar were the the best price I could find at the time. The battery mounting kit and cable are of good quality.