Advice on insurance claims

[Disgruntled]

I am new to caravaning and bought a second hand caravan last year for the first time. It is a touring caravan and was sited in wales at a farm site for the season.
We were in the process of insuring it when we received a call to say it had been damaged in a fire by the caravan next door.

cutting a long story short our caravan is heat damaged down one side and is actually a right off, though we can still use it.
The people next door are insured but as they will not admit negligence their insurance will not pay out. The fire brigade can not acertain where the fire started but we have witnesses who state that they were trying to fight the fire in a trailer that was parked touching the caravan that housed another gas bottle and fridge. The day was very hot, the trailer covered and we suspect the fridge was being used and over heated and caused the fire. Not enough to prove negligence.

Does anyone know of a code of practice on the storage of gas or general code of practice on caravaning that may help in us proving that it was a case of bad practice.

We have already spent £1000 on solicitor bills and as we say our £7500 caravan is now worth scrap value. All on the site are surprised the owner has not admitted negligence as it could have been an accident but as he says he has been caravaning for 60 years without ever having an accident and tough you where not insured.

Any help/ advice gratefully received.

Regards

Cheesed off