http://www.gdaykombis.co.uk/
3500 GBP isn't going to buy you anything good here, check out the link all the good ones are already there. I can understand your trying to save a quid, but I wouldn't import a rust bucket only to have to then do a full resto after going through all the hassle of organising it then landing it in the UK. If your going to spend money importing a Kombi get a good one, the cost is pretty much the same as importing a not so good one.
Personally I would save up and buy one on home soil. Good tidy original kombis are hard to find here, cheap ones are going to be a potentially a painful experience. Don't be fooled at looking at the pictures of the thousands of people importing real tidy RHD Kombis from Australia. They have stipulated to the many Aussie businesses which buy on behalf ,and send these over what condition they want. Basically only good original solid Kombis are sort and brought then sent in batches to the UK.
You'll find most people (including myself) are not going to help send any Kombi or any VW out of the country as its frustrating enough to see how many really good kombis are offered for sale every week in the UK from these shores. It started with split screens in the early to mid nineties now its been happening with Bays in the last decade.
Sorry to be blunt but its how it is with Kombis now over here