Does anyone know anything about Excel couriers?

pip Have you read the london bike messenger association's FAQ?

Carry the tools you need, drink plenty of fluids, have fun... and enjoy getting lost for the first week or so.

You may also want to try the http://www.movingtargetzine.com forum, lot more messengers there.

Bill, you have a number of broken links on that FAQ page.
On the couriers you recommend the following are broken links:
MPC Logistics,
Holborn Globe Trotters,
Mach 1,
Go Betweens

Just thought you might want to know.