I have never employed a garage, ever... I get my tyres fitted and balanced but thats at a dedicated tyre fitters, and they charge £5 per tyre, removed, fitted and balanced, in about 3 minutes...

"Polite Professional Services" should add to that Insanely Fast, I was shocked! It's supposed to be while u' wait, but I never realised I was waiting, they are like whirling dervishes.
All my work I do myself, If I need welding it's done out of hours by a mate... while growing up I saw hundreds of pounds change hands for naff all work, sometimes for sabotage, Yes REALLY!!!, I think it was grinding paste in the engine of a thomas45 moped, started eating piston rings...
Then onto cars and, well, throwing money away for no reason, constantly and repeatedly with no visible gains.
So, I made damn sure I can fix my own car. Cut fingers and hammered thumbs aside, I think it was worth it. I painted my front end for £37...
Brake pad replacement... £22
Those sorts of prices... I did backbox AND brake pads for £22.70 on a micra, but I'm a regular (or was) at the parts shop - I was expecting to pay about £50...
- I drank the change...
Reasons to do the job yourself...
1: the job costs £400 -> A course in auto repair costs £374 or therabouts... you probably have enough left for the part and a pint.
2: It will take a long time if I do it myself -> You get paid so much per hour -
times the hours by the wage and see if its worth doing the job yourself on a work day!!
3: I dont know what I'm doing -> Neither do any of the garages

- you're in good company

, plus that's what the manual's for
4: This list could go on for ever.
Reasons to get the garage to do the work:
1: You are naive
2: You are financially masochistic
3: You want to be pissed off
4: You'd rather trust someone else with your life, a professional mechanic... think ayrton senna.
And Yes, I am that serious, I have complained at bad mechanics who have done dangerous work for other people,

I got someone a whole new top end after a cambelt they fitted broke in 3 miles, garage wanted the guy to pay £800, in the end he paid nothing

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PS Did the garage fit those shitty denso spark plugs that look like they were forged from pigshit? CHECK!!!, they tend to... do everything a cheapo nasty plug will do, crack, snap, fall apart, not work... can ruin your engine... might be why you broke down - seems to be the fave of the crappy garages right now for their cheapness, DENSE-O... only theyre not that dense, problem with the forging, too cold a furnace I suspect, keeps the prices down using less fuel...
Yeah, pretty passionate about shite garages... look, now I'm swearing.
Sorry to hear you got ripped off/swindled/parted of your hard-earned... now next time change your own plugs and get quotes first for all work, always see your old parts for inspection, it proves parts have actually been changed, gives you an idea of the condition of your car and it's your god given right.
(No offence intended, Apologies in advance for any that occurs - I dislike bad garages Grrrr!)