Yes, I buy gifts on ebay or from other retailers and get them to send them direct to the recipient. I do not bother about fancy wrappings for birthdays, but at Christmas, I send them to another member of the household with instructions to wrap them and label them and produce them on the The Day. Cards I just post, if they are small and light and do not contain letters, they are not outrageously expensive to send.
To think that London, or anywhere else for that matter, does not belong to any one demographic