Our 7 year old Range Cooker has not been right for a while, both oven bulbs have gone, I couldn't get the glass covers off by hand and the main door was not closing properly, clearly one of the springs in the hinges had failed. Knowing nothing about cookers I assumed it would be a big job, however some Googling and Youtube convinced me that I could easily fix it.
The manufacturer, Brittania wanted £299 just to turn up

and a set of hinges from them was over £100

. I sourced a pair off
eBay for £45 and the stuck glass covers for both the oven lights ended up coming off just by using a rubber glove to get a proper grip and use a bit of brute force (two bulbs were a fiver)
Looks like the problem was a broken pin in the hinge, it was a bit of a faff fitting them both, the door had to be stripped and the glass removed to change them over, but it only took about an hour.