Friday 8 February 2013 3.53pm
Are they called Southbank Mosaics
? The people who did the fountain outside the Garden Museum
, and also some Blake-related stuff down Hercules Rd? They have done some projects which sound similar to what you're proposing, and may have faced the same challenges, perhaps?
They have a website (IIRC, they used to be based in the church at the north side of Waterloo roundabout), and "Mosaics" is definitely part of their name.
(Or - along similar lines - might BOST be of some help?)
...if you press it, they will come.