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Bought it from these guys http://www.garden2office.co.uk/
They do DIY Kit so going that way to save some money. I look into it for months and they came out the best value for money. The quality of their build is really good (mainly made in Sweden). They have built one of friends garden room already and it was outstanding.They mostly use plinths too which is absolutely fine in 90% of the case but I was advised against it for my purpose, heavy weight will create vibrations...
fyi - the guy selling me the garden room recommended reinforcing on my side...