ditch72, I did that today, lol~ Schwab says no problem at all placing a trade on the LSE, the fees might be more, but they have a trading desk there and can route the order easily fwiw.
Fidelity covers all since they are global. http://www.fidelity-international.com You might just need to call to place the order! Only the commission will be higher! I have the phone number ready in case I need to use :)