>For payments in GBP the fee percentage for the first 100,000 is 0.35%, and for any amount above that it’s only 0.20%.
https://transferwise.com/gb/blog/send-large-sum-of-money-how
There's likely to be a similar charge for making a transfer that large from a bank to a Bitcoin exchange anyway.
Strike (https://global.strike.me) has built a product in which they use Bitcoin and the Lightning Network to send money (fiat currency like USD, EUR, etc.) around the world instantaneously and at virtually no cost. In some cases, they are able to offer exchange rates that are better than the inter-bank FX rate.
Explanation of how it works: https://jimmymow.medium.com/announcing-strike-global-2392b90...
> Strike maintains a live Forex rate and compares that to its own rate before every transaction. However, in our testing, a Strike international transfer has never been done at an unfavorable exchange rate when compared to Forex rates. Shockingly (or maybe not) it was even cheaper sometimes, exposing the flaws and lag in Forex rates and how they are used. Bitcoin, as the most liquid, globally transferable asset is already acting as the new world reserve currency with Strike.
Strike is promising a lot (which is exciting!) but don't have a fully functional product yet.