Just seen this Anton ..... I seemed to have been thinking the same as you .... actually had the van done this week by a chap in Bridgwater
http://www.ad-ae.co.uk . Young chap who was recommended by Quantums.
The price of £299 was originally advertised on Quantums website and they stuck to it for my job.... its now gone up to £499 ... The bridgewater guy will do it for £400 if you contact him direct.
The job entails removing the ECU which is mounted on the side of the engine ( bit of a fiddle ) . Then take the ECU apart (gulp) . Adam then had to solder a resister on the board then connect it to his laptop and power it up. Quantums then remotely take over and remove the original mapping and load up a new rewritten version. Once its loaded Adam disconnected his laptop cleaned the housing, removed the soldered resister, resealed and assembled.
Once it was fitted to the van we started it up and did a few checks, then we took it out for a test drive.
The difference is amazing. forgetting the figures the difference in actual torque on the road is brilliant. The van still feels gentle and smooth at low revs but the power really starts to come in around 1400 revs and pulls nicely right through to 2400. I am really looking forward to this weekends event to get a good feel of how much difference it makes towing.
I have to say Adam really knows his stuff and is a nice chap. I would recommend him highly
I'll keep you posted
Andy