Make it clear to the teacher that you're starting again, not from scratch, and remember there's no law that says you have to have a lesson a week - most teachers (around here anyway) are quite amenable to fortnightly lessons, and it often makes more sense for adults with daily commitments to be realistic about the amount of practice they'll be able to do.
Good luck - and HAVE FUN; it's only a game!
I would highly highly recommend Craig Ewens. He is based in Belsize Park and is an extremely talented pianist. He's a patient teacher, and specialises in teaching adults (like you and I). He has been teaching me for around six months, and my girlfriend for about two months.
Here are his details from the Incorporated Society of Musicians (where I found him)
EWENS Craig AGSM(PfP/PfT) ConcertRecitalDipGSM
Flat 16, Howitt Close, Howitt Road, London, NW3 4LX.
Tel: 020 7483 4405
Fax: 020 7483 4405
Give him a call and tell him I sent you
Hope that helps