As has already been mentioned, Parkside Dundas produce a kit of the BR Palvan (listed for sale at £9.00 + P&P on their website), which along with some styrene sheet and a bit of hewing with a craft knife, will produce a more accurate model of the CIÉ pallet van for less money.
http://www.parksidedundas.co.uk/acatalog/copy_of_BRITISH_RAILWAYS.html
Some BR promo material can be seriously dodgy alright... https://images.encyclopediadramatica.es/b/b9/Gary_Glitter_British_Rail_Poster.jpg
I think the marketing staff of the time would rather forget about that one now.
It'll probably be containers as the cargo will have to be transported by road from the railhead to its final destination.
Nah, I have a lie-in instead!
With all due respect, this is the attitude which has led to us having to contend with 'ready-to-run' (and I use that phrase in the loosest of terms) locomotives and rolling stock which barely resemble the real thing, and for which we are charged a premium price... the producers know they can get away with throwing something together with as little effort as possible - and charge top dollar - "because the Irish lads will buy up any oul' *****". It's even more frustrating because 'doing it right' in some of these cases wouldn't cost them anything extra, other than a little time to actually plan things out properly.
Anyway, regarding the wider argument taking place here... I find it slightly bizarre/amusing that people are arguing over how much a prototypical 20ft chassis would cost to produce when people are prepared to pay over €70 for 'RTR' tin vans which look like they were squeezed out of a tube of toothpaste.
True, there were four editions. The first (around 1987, I think) had a photo of an A class on the cover, the second had an NIR Hunslet and MV, the third had a brand new 201 in Canada, and the last had a loco line-up at Inchicore.