Solar panel installers are quite lucky in that to claim Feed In Tariffs a customer needs to have proof that they have paid in full for the PV system so they're usually very keen to pay asap.
Not quite the case, the person applying for the FiT has to show 'proof of ownership' - the original purchase contract is actually sufficient for that, whether they've paid in full for it or not.
@puddy - To be MCS certified and to deal with consumers, you have to be a member or RECC (nee REAL), one of the RECC conditions of membership is that you MUST issue deposit and workmanship insurance (this only came into force approx April 2012 before that it wasn't compulsory)
Their are lots of deposit and workmanship insurance (DAWI) schemes available for installers, - we use EcoSure after researching about half a dozen, we found that it fitted our and our clients needs best.
I thought the deposits were locked into a third party account until customer gives permission to release money ?????
They should be and most of the contracts I have seen do as well, they have a clause that specifically includes that permission (after the 7 day [working NOT calendar] cooling off period has elapsed.