A few weeks ago, I was in North Wales and alled into the big retail shop by LLanfair PG Station. I did not see them on sale, but someone purchased from there a 00 gauge Hornby model of a good wagon with the full name of that famous town with the longest name. I have looked this model up on the internet as i'd like to add it to my collection, but there seem to be about three versions with ref numbers, R 6603, R 6548 & R6716. All at different costs. What would the differences be? Tks.