which part of the UK?
for metalwork there are more fireproof things than wood, ask around for anyone replacing a concrete sectional garage or shed, you can often get them very cheap or even free, they can also be easily made to various sizes from the same parts, eg a 20 foot by 10 foot garage could be a 10 by 10.
what you want to make will determin you tools, get good used tools rather than cheap new tools if you can.
if local call in and we can talk ( NN14 1QF), I also go to tool and engineering events and there is one im going to 65 miles away in 2 weeks.