Thanks so much for your detailed response.
I meant to say that I want to spend more time in Britain when I retire. The USA will most likely remain my domicile (e.g., it's where my family lives, most of my money is invested, etc.).
There are pros and cons to using the remittance basis. Perhaps, as you pointed out, it would be better to be taxed on the arising basis. Hopefully, the Double Taxation Agreements between the USA and the UK will help mitigate overall taxes if I chose the arising basis.
Again, thanks for taking time to respond to my post. Cheers!