hi barry,
sorry about the incomplete message, something happened and cut me off in mid type, but what I was going to say is that we sail at a little place called pakenham water mill on the A143 near bury st edmunds and at 70 miles round trip I don,t get many days sailng in a month, although it is a nice place to go.
I think your best bet would be harlow they sail at a place called burnt mill, a bit to the north of the town, you could have al look at google earth it is a marina for narrow boats but they have an area set aside for models, they are a friendly bunch down there and I am sure they would make you very welcome.
hope this helps yours ron. ps. it is alongside the railway line to help you find it