I took some friends from the Nehtherlans to visit the Welwyn Roman Bath which is located just under the A1M motorway. Parking is easy and the attraction is just a short walk.
The whole area is actually quite small- I have visited the Roman baths at Bath so do not even think of comparing the two!.
My friends and their two young children enjoyed the experience and it is worth the visit just for the history alone, but don't expect too much.