Sounds great, very excited for you mate!
I also had an online quote from a dealer near Leeds via carwow.co.uk. I'm not sure about the model you were looking at but buyacar.co.uk (even with their £495 hidden paint fee!) are still £400 cheaper and they'll deliver it for free.
I did hear back from drivethedeal.com with regards to buying the fiesta as a retail customer. Their final quote was about £130 more than buyacar.co.uk.
I'm still waiting to hear back from my local dealer (whom I would prefer to go with anyway).