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You'd have to be going some to overload a 13A socket if you're only running one tool at a time. Unless you're running a 2/3kw heater plus tools, then you could manage it fairly easily.
Easy to work out.
Current (Amps) = Watts of whatever you're powering / Voltage (nominally 230 in the UK, often closer to 240 but safer to use 230 for calcs)
e.g. a 3kw heater = 3000 Watts / 230 Volts = 13Amp
This is why you'll never see anything over 3kw with a domestic 13A plug on it, and why things like kettles and immersion heaters are very often 3kw, or close to it.
So if you had a 1500w table saw and a 1000w extractor, you'd still be comfortably under the 13A, but you might find the spike from the table saw starting up is enough to trip an MCB/RCBO.
ThePeginator
I did something similar when I converted my garage. I added, after an electrician's advice, a fused 13a spur internally. What that means is the garage is isolated and will trip the 13a fuse rather than the main distribution board. Although I'm not sure a fused 13a will be sufficient for all the planned mains powered tool.