What fees can I expect to pay for investment advice as a US citizen in the UK?

If you're looking for a full wealth management service including financial planning, initial and ongoing investment advice, portfolio management and various aspects of cash management, the industry range starts from 2% down to 0.5% per year.

What you pay will depend on the firm you use and the size of the investment. The base model is charging a percentage of assets under advice every year, so you can most likely expect to pay around 1% per year, depending on how much you're investing.