I can do the work from anywhere but prefer people who call me to assume I'm at the UK office and to see that number if I call them.
I know a few micro-businesses (one man bands) running their operations from their villas in sunnier climates whilst presenting a UK number. Vonage appears to be a popular choice.
(And to put the mods at ease, no I am NOT advertising Vonage, have never used them myself and don't work for them either).