A very successful large bogie flat wagon was introduced for cross channel traffic in 1979. Built over a number of years they carried a variety of traffic to all parts of the UK. Their use continues. An article on modelling these wagons is in Model Rail - November 2004. A 4mm kit is available from Genesis http://www.waveneycottage.co.uk/page8.htm Heljan have introduced 7mm & 4mm models for these wagons.