I used Kraken to buy bitcoins many years ago, but I'm looking for a way to buy a few hundred £ worth each month that doesn't have a massive cost overhead. Since Transferwise shut off cryptocurrency exchanges, if I do a transfer to a foreign bank account direct from my bank then I have to pay £25. Is there a better way? Also, if I transfer to Kraken as GBP, then it's difficult to buy as the GBP/XBT is almost dead, so I need to convert to USD for which my bank give me a poor rate costing me another 2% or so.

So if I want to buy £100 worth of bitcoins, it's going to cost me £127, which is pretty crap.

I know I can make card payments with Coinbase, but that still incurs a 4% charge, which is an improvement, but still, a 4% I'd rather not pay.

What's the best way to buy bitcoins with GBP?