Most of the crypto exchanges work solely in crypto, apart from a few like Coinbase but then they only have four currencies.
Bittylicious is a good place to buy crypto with sterling. Ainars mentioned another one a page or two back as well, but Bittylicious had better rates at the time. Set up a wallet such as Exodus and use the addresses from that when you buy, then you can use it on poloniex or cryptopia etc to buy other coins. (Exodus's conversion rates from crypto to GBP are very optimistic so it appears like you have a lot more value in GPB than its actually worth if you try and spend it)
Shapeshift.io is also good for buying some coins, but its quite limited compared to the big ones. You don't need an account on it though - just put in wallet addresses and amounts and it does its thing.
Personally, I'd suggest using something other than BTC if you're buying other currencies with it as the network fees for BTC are crazy for small transactions, whereas LTC for example is much less. LTC can be a little hard to come by on Bittylicious though.
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