Just about to say the same! I got mine (Set of 4) from Mondeo Spares in Stoke on Trent so they're not too far from you. Seehttp://shop.mondeospares.co.uk/steel-wheels-31-c.asp They were excellent to deal with and delivered them to my Bro in law in Rotherham (S Yorks) for about £6 a wheel. He fetched them north when they came on Holiday in September. This websitehttp://www.carlsalter.com/wheel_fitments.html is a handy guide to what will & won't fit. I got mine through a listing on Ebay and put in an offer for £23 a wheel which they accepted.The Mondeo steels are 6.5"J as opposed to 7"J for the alloys, so there are no problems with clearance. The narrower wheel is still suitable for the 205/55X16 tyre.
If you want them for winter tyres I can heartily recommend Cooper Weathermaster (£370 for 4 locally, fitted & balanced ). My son ran a set on his Xsara last winter and they are excellent, quiet on the road, great in the wet and AWESOME in snow! Nearly time to think about putting them on!
Those wheels on ebay end at about half past 6 Monday evening. (17th) They're BRAND new and sat at £40 for 4 wheels which will fit your C-Max, complete with nuts and suitable trims. (Actually for a Transit connect, but they'll do) This lot is worth between £400 and £450 at dealer prices. If some one needs some wheels. ACT NOW!!!!!!