when i bought my sei i got it from somebady who works a fiat and he told me since mine only had one key if u take it to a fiat dealership they will cut and code a key for you and it will cost about 50 60 pound so just depends how much u need a spare key

All replies seem about right, remember your location will be a factor in accordance with price, Chelmsford is a bit posher than sunderland in most places i wouldve thought so perhaps because you live around that area the prices will be slightly more although you are getting basically the same service