Some people here need to get a grip - inflation people - twenty quid in 1975 is GBP161 today. IIRC 1/24th Scale cost about 15 - 20 odd quid when I was a kid (and was a once a year present at best). This idea of 'pocket money kits' is a bit deluded - what scale, what quality, what year...? Some of the cheap kits in Series 1 in the early Seventies were very basic with poor fit and little detail - not much like the kits of today.
'Pocket Money' kits is often a claim from people who don't realise how affluent they or their close relatives were.