If the 2i has fully comp insurance (99% of fully comp policies have glass cover) then the cheapest way to do it is claim via insurance for it - your excess will probably be £50, £60, or £75 (in some cases it's £100, but thats not very common)

If you AREN'T fully comp, then going to a big name glass replacement company like RAC Auto Windscreens or Autoglass isn't going to be cheap.

Your best bet is to buy one yourself, from a supplier (and Ford won't be cheap either) and get a windscreen fitter to fit it for cash (if it was me, I'd only charge you about £25 to fit it) or if your confident, fit it yourself (2i's are "string-in" screens - more info on this available if you want.need it )

Ring this place up, and they should give you a good price;

Master Auto Glass (not the same Autoglass I work for, they are a supply only comany and NOT affiliated with Autoglass Ltd in any way) - 020 8531 9219