imho it's not going to be worth it.

if you're looking for long-term returns, I'd say you're better off taking a portion of your disposable income (say a minimum of £100 every month and saving it into Bitcoin (and only start using it after 5 or 10 years). any portion of the disposable income you're comfortable with saving, and won't need anytime soon (20% is also a great start if you're unsure)

you can save the rest in either USD or GBP and just use it as and when needed.

this is highly personal though, some people prefer avoiding #bitcoin altogether and some save as much bitcoin as they can, sometimes saving more than 80% of their disposable income in Bitcoin.

I personally think this only makes sense if you are really going to invest regularly (as you earn new money) and keep it for an absolute minimum of 5 years, ideally longer.