Ohh, I have that covered! Between EKP Supplies and the Southampton Boat Show, I am pretty well stocked with both BA and Metric sizes of non-ferrous NBWs.
Chichester Model Boat Club are having one of their canal runs this coming Sunday, 12:30pm depart from the basin. At the moment SS Ohio is my most likely model for a day out. The question is, can I paint and fit 22 tank hatches by Sunday,,,we shall see.