I am director of Bulstone Restoration Limited ONYX IV have worked for me on a number of our historic projects as sub contract stone masons.The works carried out have included building with new stone, re building with original historic stones, dressing and tooling finished stones & rag stone walling (both random & coursed). Most recently they have been working on two phases of our ongoing works at the Tower of London-main contractor CWO. This is a World Heritage Site and all work carried out has to meet the exacting criteria and constraints set out by English Heritage. They have always managed to comply with all the requirements asked of them under these circumstances. I have found all of their operatives to be honest, polite, hard working and punctual. Some of the historically important contracts they have been involved with are: Tower of London – Devereux Tower. Tower of London – Brick Tower. Buckingham Palace – Inner Quadrangle.