So I came down to London on Sunday night, only to find I'd left my credit card at home.

"No problem", I thought, "Mrs Mouse can post it to work and I'll have it tomorrow."

Tuesday arrives and I ask reception if they've received any mail for me. "No, we haven't", is the reply.

Wednesday: "No we haven't"
Thursday; "No we haven't".
Friday: "Yes we have".

Puzzles:

If you're bored and have nothing to do whilst waiting for your post, try this GCHQ Christmas Card. When I got it, their webserver seemed a little slow, perhaps due to all the tracking software...