I think the help you receive depends entirely on the dealership.
Lookers in Preston would only help if I book my car in to have the bolts removed and buy a new full set!
I went to skoda who were very helpful, got the set of keys out, found the one I need and said they can only order a full set, but weren't pushy.
I've found the key I need on eBay for £5.
Jas