Truma secumotion gas regulator

As some of you may know my truma regulator gave up the ghost at Bridlington and I need to replace it or change the system as I don't drive with the gas heater going .
It has a two bottle connector above and I think the model is the 52300-03. 
Any ideas would be appreciated as not as yet been able to enlist help from elsewhere even the one you suggested Bob

Pete

I have a complete unit that was only used for a week when the van was new as the previous owner quickly had a under slung tank fitted.
Make me an offer?
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Hopefully this is now sorted -or will be at Tabley!