When I took my Ferret to Beltring the first time, some bloke had a go because the headlights were wrong for the period (being halogen). I didn't care, I was just happy to have a vehicle so I was able to take part. I think the comment about ignorance is very valid - I do not have an army background so couldn't tell you what is wrong or right about most of the vehicles on display. I still enjoy it though, it would be a shame if folks didn't take their kit along.