I don't know how things work in the UK so what I'm saying might not be worth the bits it took to form the characters on your screen, but...
I'd say you are being fleeced.
Here, if a company makes a quote, they either return it repaired at that price, or they get prior signed approval from the customer before proceeding with any heretofore unknown needed repairs. Sometimes there are unforseen things wrong with your unit. And if they know, and/or should know that there is a 'ton of extra work' to be done if one piece is replaced, then they are bound to provide that information and or quote a proper price upfront.
Secondly, if you give your unit to a company for repairs, then they just send it to another place to do the repair, then you are going to the wrong shop. They are just middlemen who are tacking on their profit to your bill for simply sending your unit elsewhere. I personally take my units to a manufacturers outlet. If it doesn't have a big red official 'Canon' neon sign on the building, my cameras don't enter. If there is no official big blue neon 'Sony' sign on the front of the building, no way is my TV going to be carried in there. (etc etc...). If there is no manufacturers building close - I will pack it well and send it to one.
'recalibration' and 'realigning' are usually equivilent to a 'visual inspection' of your car. Just something to suck some money out of you. Not to say that it doesn't have to be done to some units - but this would be obviously known by the repair depot in advance, and should have been explained to you up front. You should be fully able to 'decline' the 'extra' repairs. Unfortunatly if they are truly unscrupulous characters, they will 'misalign' or 'uncalibrate' your unit as a sick joke, and to make you bring it back for more repairs.
If the repairs are going to cost as much as a replacement then you should definatly get a new one and not bother to fix the old one.
I think you are indeed being fleeced and your statement...
...is totally correct.
I have paid a non returnable 120 quid deposit and I feel like they are trying to rip me off. I think they are duty bound to do the work for the cost of the first estimate.... ? ? ? ? I just dont believe what they are saying about 'recalibration'. I think they are going to keep my 120 if I say no to this extra work and cost.
If these people are 'authorized' dealers for your make/model of unit then you might consider threatening them with an 'angry consumer complaint letter' to the manufacturers head office, threatening their status as an 'authorized' dealer. Its a semi-bluff really but it might produce some results.
I feel your pain, we have all been there
My System Specs:
Cameras: 2 x Canon XL1s
Computer: Dual Intel Xeon 2.8Ghz processors (hyperthreaded) - Intel SE7505VB2 mother board - 2 Gb PC2100 RAM kingston -Adaptec FireConnect 4300 -2xseagate 10K scsi hdd 150G ea -2xseagate 7200 ide hdd 200G ea - Plextor PX-708A DVD burner - ATi Raedon 9800Pro video with Dual SUN 21\" monitors - Sound Blaster Platinum live!
Software: Windows XP Pro with SP2 - Pyro Pro (adobe\'s premier pro, encore DVD, and audition bundle)