http://cgi.ebay.co.uk/Audi-VW-skoda-seat-ALLOYS-185-55-15-NEW-GENUINE_W0QQitemZ230021152245QQihZ013QQcategoryZ9888QQrdZ1QQcmdZViewItem

Will these fit my car?

No, wrong PCD.

i believe they wont as the fitment will be slightly off (the new octavia uses a different fitment from the mk4 golf/mk1 octavia). don't quote me on that though

edit: beaten to it and the above sums it up in 3 words! anyways aren't 15's a bit small?

No, wrong PCD.

Damn, they are quite cheap as well

What is it I am looking for from the wheels\whats a pcd?

112 PCD, around ET 45-50

don't know your budget (guess you want fairly cheap?) but a quick look brings up maybe the following?

http://cgi.ebay.co.uk/AUDI-A4-VW-GOLF-17-STAR-ALLOYS-TYRES-GENUINE-AUDI_W0QQitemZ200021014695QQihZ010QQcategoryZ9888QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/VW-Golf-Mk5-GTI-17-Alloy-Wheels-and-Tyres-Genuine-VW_W0QQitemZ180020742971QQihZ008QQcategoryZ9888QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/GENUINE-VW-16-IMOLA-ALLOY-WHEELS-TYRES-FROM-MK5-GOLF_W0QQitemZ260024603400QQihZ016QQcategoryZ9888QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/17-Genuine-VW-alloy-wheels-new-Golf-Mk5-Fitment-A3_W0QQitemZ320021566209QQihZ011QQcategoryZ9888QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

All good

I assume I can then just change the centre cap for a Skoda Badge?

Usually yes.