The Wife and I, got our european mileage update today. I had some activity so this was listed, but the Wife hasn't and in the space where i had activity she had this offer listed:

"First, register for this offer at http://www.united.com/offer/mpi116 Then register your email address and opt in for member communications to receive 2,500 bonus miles. You must remain opted in for at least three months to earn the bonus miles. Just visit unitedairlines.co.uk select "Update Profile", click on "Register now" and complete the online form. etc etc etc."