Thanks for the responses.
I'm glad to hear that shares are treated as capital and not income by the UK. In the UK I've definitely taken the keep-it-simple approach to investing. Nothing other than savings bonds and pension funds.
The mutual funds I have in the U.S. are collection of funds I owned before I moved to the UK, plus some funds I invested in recently from money inherited from my father in the U.S. I'm at the stage of life where I am more concerned about generating a stream of income from the funds versus trading them. I decided to trade a handful of funds I owned for a very long time for others that are better performing, not realizing there would be an issue.
My financial advisor (aka salesguy from Wells Fargo) said I could set up a separate, managed fund of individual stocks. Sort of a personal mutual fund, but it sounds a bit iffy from a UK tax perspective.
In any case, I try to keep in mind that I'm paying tax on a profit and although it may be at a higher rate than I'd like it's still better than the inverse. Arghhh!