I started off Googling, then had a look at Fleabay, but notice they were offering European and US versions, I don't know whether there are any fundamantal differences between the EU and US models, but remember the hassle with videos, so decided not to risk a US model. I spoke to DogCam who were very helpful, but they were not that good on price and didn't have all the bits I wanted in stock (primarily the wi fi combo unit). I ended up buying from Amazon. Prices were competitive and I managed to order everything I wanted and hopefully it will all be here in time for the weekend.
I have attached the sellers and prices, if it helps: