When I was a kid we had a Montego diesel that was the same way, only instead of the shutoff valve itself it was the control circuitry that went on this, so the shutoff had to be wired into the battery itself, and the only thing my Dad could figure out was with an old light switch hidden under the lip of the bonnet! Comedy.
Why pay someone else when it's a simple job and you have the tools yourself... Over here Main Dealers charge £100+ per hour in labour!
Almost £40 to change a headlight bulb, which is a 10min job and requires undoing 1 bolt and a plastic clip.. And as for the battery Chris, It's Silver Calcium rather than lead I believe, fitted to all Fords nowadays.
Not over here, everything is still lead acid. What is the life span on a silver calcium battery like? As for installation. If it was easy then it would be done by now. Sometimes it's worth paying someone else to do something rather then risk breaking something. Edit: After a bit of looking around finally found this: www.centurybatteries.com.au/index.php/component/docman/doc_download/2-battery-talk-issue-1 So in short without being given an actual number I would say that 5 years on average for the battery life. Which brings me back to my original point, if this is the original battery in the car then don't bother with chargers or driving it for hours. Just replace it with a good high quality brand.
Engine bays in European cars are often small and very cramped so something like removing a battery may involve removing a few other parts first. Dealer/garage labour prices are very high and something like taking a battery out isn't hard (generally just needs a socket set) it just takes time, so is worth saving a lot of money and doing it yourself. I'm not sure what european models you have over there (the Mini One is a good example of a cramped engine bay!) but all the US cars I've seen have big engine bays so are much easier to work on! Looking at the engine bay of the Focus it'll either be the airbox and/or scuttle plate that needs to be removed to get at the battery. Hardly complex parts, just a bugger to find all the bolts