It is now taking on a motorhome feel at last.
Having found my 110v transformer I thought its time to see if the ambulance battery charging system worked. Pleased to report it does. The unit can be seen under the passenger seat. I am going to keep this as it is a 40amp smart charger, I just need to find a small 240v - 110v transformer to tuck in somewhere. I did speak to the tech. support at the manufacturers to see if it had an option inside to switch it to 240v. Sadly not. But I was told this charger is about £450 +vat and for the price of a transformer it was worth keeping. I agree. The charger is charging both the start and domestic batteries.