I've just picked up the van, the dealership were pretty much stonewalling because I was loudly complaining that it's a piss take that a 62k mile diesel engine needed replacing at such a high cost, everyone in the dealership was just staring at the ground (it's not really their fault, I didn't buy it from them, and ultimately they're not VW themselves).
The quote I've got back lists £7871.00 for a "stock base engine (long block)", £1440.00 for a Catalytic converter, £1845.00 for a diesel particulate filter and £295 for a lambda sensor, then there's a further three pages worth of odds and sods like washers, gaskets, bolts, etc. The labour is quote at £2070.00. All the prices then need VAT adding on, on top of that.
I asked about this CXEB vs CXEC thing because the question I asked at the dealership of "will this replacement engine be like-for-like?" seemed to be met with a "yes", and that suggests they're just going to be fitting another engine that can potentially just have the same problems in the next few years - the engine, it turns out, has a 2-year warranty only, so basically if the problem repeats again within a few years, I'm totally screwed.
I will need to go and speak to VW care and see if they can help in any way - at present I'm unsure of the benefit of spending the above amount of cash for something that could just repeat itself within a few years, what a bizarre situation to be in.