Short answer but precise and contains. Even though we know the purpose of Bitcoin was created to be separated from banking or become digital money from physical cash. Additionally, the goal of bitcoin is to eliminate the need for trusted third parties such as banks or other intermediaries.

So the idea conveyed by the OP is very contrary to the principles of Bitcoin itself. Moreover, if we talk about security, there are many wallets that offer good security so you feel safe storing them there. So your wallet is your own bank, not creating a Bitcoin bank especially with the fees stated by the OP of 100 GBP + 1%.