Sometimes I want to buy stuff that is only available in London if you go in person, I don't live in the South (& don't currently know anyone in central London that I can ask favours of) - has anyone used errand running services & how do you find them? The kind of 'queue up for a ticket for you' type of service - quotes don't seem OTT expensive, but does it work out that way in practice/are there pitfalls? If anyone's had any experience, ta much.