Unless I've misread his reply, that's what Jason at Absolut5 has advised.
Still pondering my options at the moment. If I want to keep the parking sensor display (which I do) then it looks like I'll need to spend upwards of £900 or go for the RDC510 which seems to have been around for about 10 years now so not at all up to date with the latest technology, but does give me the bits that I was after. That'll cost me about £500 fitted so quite a saving but I wonder whether either of the options would add to the vans desirability should I come to sell it one day but I suspect not.
If you lose the parking sensor display does that mean the heating/air con settings are not shown on screen ?So, mini update, I was about to go for the RCD510 option but it looks like my cunning plan to go for a unit without sat nav (Kenwood Dmx7017dabs) but with a reversing camera added to overcome the loss of parking sensor display might be the solution. Just got to make a final decision on it but that's looking like the preferred option.
If you lose the parking sensor display does that mean the heating/air con settings are not shown on screen ?
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