The tricky bit was removing the rear seat, mainly because I was looking at the instructions for the wrong model of car; the right instructions for me were on the Focus Fanatics forums. Fitting the actual bar itself was comparatively easy, just two bolts (after you’ve removed the bungs from the bolt holes), I’ve written a StackExchange answer. I bought the Isofix bracket and Torx driver set from Amazon.
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Looks exactly the same as mine – I had a nightmare getting a T50 Torx driver locally (failing, ultimately) and found putting the seat back to be a bit of a mare!
Simon, this is quite funny.
I’m also strugling with Ford Focus, although I write about it in Polish :)
http://piszek.com/2011/04/wymiana-silnika-focus/