I took the PCP then withdrew after 3 days, paid off the whole sum and still kept VWs £1k.
This was a process suggested by my dealer when I made the deal.
I also used CarWow to find the best prices then took them to my regular dealer and told them they could have the sale if they could beat the lowest, which they did.
I also told them what I wanted for my trade-in and they were happy to accept it.
By following advice I gleaned from this forum I saved over £4k.
Your quite right to do your homework on every aspect of a new purchase.
When talking suppliers these are my tips.
1) dictate all discussions and only speak with the most experienced member of staff.
2) remember its your money and you choose you spend it, dont be a sheep and get fleeced
3) know the product so you dont waste time looking (being seduced) at the showroom cars
4) all added extras eg; mats etc can be given to you by the dealer as sweeteners so ensure you get them NB Golfs come with plain carpet, all mats are extras.
5) at the end and before you sign say "oh and you will be fitting a FREE a dash cam - as its Christmas".
Hope this helps.