Hello again James,
According to 'check car details' web site, it has recently been taxed (333days to go) and the last issue of a V5c was December 2023. Heck, that number is the sequence preceding my mates red 550, yours being TRH, his Was UAT and back then in Hull, that was the next sequence. Did your Dad buy it from Hull Motorcycle Centre in Witham? The late Stuart Myers was the manager and was at school with me!
Ian
Not sure if a 'mate with a uniform' could find out more details these days - might be a sacking offence now!