Oooo I had one... but I had Tia at the old Greenwich District hospital before it closed down. At the time it had one of the best midwife led labour wards in the country..
I had the epidural through a drip direct into my spine, they leave a canular (drip needle) in though, but you can't feel it if you lie on your back... It never needed topping up, they just replaced the bag when it ran out.. Also I could feel all my contractions, they just didn't hurt. I could also feel the pressure which I think helped me push Tia out so quick... Its because the drip can be controlled depending on how you feel the contractions... and as everyone feels pain individually it makes it easier to regulate. I never got up and walked around though.... so I am not sure that you can do that
The only problem with it is that if you lie to one side (which I did

) the anaesthetic tends to spread on one side and you get one sided contractions.... So the anaesthetist had to come back, pull the canular out my back a bit and push it back in... didn't hurt at all... but having one sided contractions isn't a lot of fun.
Whether Greenwich (well Woolwich now) still does this I don't know, I just know that they don't do it here in Spain....