UK banks - how to transfer larger sums

I have previously used Barclays to transfer larger sums of money to Kraken (several £30-£50k transactions within a one month period). Now I can see that Barclays have a £10k monthly limit for crypto.

What would be legitimate options for me to transfer £50-£100k to an exchange or be able to purchase that amount of BTC? This isn’t a purchase I want or need to make imminently. I’m just thinking about potential future purchases. I also need an account that accept large amounts of money from exchanges.

I have considered opening a Revolut account but have read mixed reviews and would be surprised if they let me transfer larger sums as a new user. Also thought about opening a Llyods account but will probably have to call them first. Any other options?

With these restrictions i wander how large transfers of fiat to exchanges are happening in the UK. Someone must be doing it somehow.