Don't know if it's close enough to the City Centre for you, but there's a TLC party scheduled on Saturday from 12-3pm.
3 girls for 3 hours for £100, but obviously in a group party situation with a few other like-minded guys.
The line-up looks like hot MILFs this week...Brazilian Joy, Spanish Gina & Russian/Latvian Irene...all around their late 30s. Gina is quite small, just over 5ft, but the other two are taller, especially in heels, not Amazons though.
It's location is just off the Ring Road, about 15 mins walk from New Street station. Postcode is on the website.http://www.tlc-club.co.uk/events/