I thought it might be good to have a thread on Concierge Services. Below are concierge services which are available to become a member.

Quintessentially
I had a membership some years ago and ditched them, they were utterly useless. Vertu got fed up with them sometime ago and left them for TenUK.

TenUK
Very efficient and good, run Vertu globally (except US). Only issue is with their night people who can be slow sometimes.

Les Concierges
They run Vertu in the US and seem pretty good. Requests handled quickly and people have a good idea about what they are talking about. Would not recommend for Jobs needed outside the US.

Amex Centurion
Very good for travel, lots of connections but more of a back up than a replacement to the ones above.

Those are the three main ones I have used, I will add others to the list if you like.