Thanks everyone, your advice did help us (along with a Pearsons guide) to make our mind up. We spent the first week cruising the Llangollen which was not as busy as we expected, and a great introduction to narrowboat holidays.
The secfond week we went up through Chester and walked the walls as suggested, and continued all the way to Ellesmere Port where we spent a night in the musuem and had a day trip to Liverpool as well (on the train in case your wondering ). Then we went down to Nantwich for a look around, got a bus to Crewe to see the train museum, which had actually closed for the winter the day before and back to Middlewich the night before we were due to hand our NB back.
We had a wonderful time and we are going to be booking next years holiday before the end of October to make sure we get some great discounts from the holiday company. We feel ready to have a go at the Cheshire Ring next year, now we know what we are doing with the boat and the locks.
Vee