So it looks like the cash to help pay for the car will be sat in my bank on Monday morning, but my 85D will not be ready until June according to My Tesla, but probably August as per the order page when I confirmed. I had thought about getting an ex-demo and trading back in, but I do high mileage and Tesla claim to depreciate trade-ins at 2% pcm and 45p/mile, which would not make financial sense if I have it until August. I could rely on selling privately, but assuming buying ex-demo from Tesla will be at a premium this could be risky approach. They sent me a list of some ex-demo P85s and there were a few between £60-£70k with minimal mileage on (it is tempting to drive a P85 temporarily since I chickened out on my order...mainly due to range concerns for my 210 mile daily commute, but the new torque sleep seems to be working makes it more workable, but also the extra £15k+ was too much of a stretch with dropping some options). I have no ISAs at the moment (cashed in when interest rates went low), but I could open a couple for my wife and I and keep the funds generating some tax free interest for 6 months. Plus the cash ISA rates will be higher than the 1.84% loan financing - not sure if ISAs will pay interim interest or just annual though. Or open a couple of Santander 123 accounts (not tax free, but I think the interest is higher).