A bit off-topic, Sandy, but if you have a few shares it may be worthwhile opening a share dealing account with somebody like Hargreaves Lansdown. Your shares are held by them in a "nominee account" (meaning you don't have to keep share certificates) and you can sell them online, receiving the funds in just a couple of days. Also the dealing charges (£11.95 per deal, regardless of value) are considerably lower than those made when you deal by post or phone. You can, of course, buy as well.
Good luck with your trip.