Links readily available. But it's not the first time that Betty has been turned over by her VX dealer :-X
Doing the job correctly, means either the correct shocks or new shocks, springs and a couple of hours to remove the self levelling gubbins. Pulling the fuse is to totally half arse it.
Genuine non SL shocks are circa £100 each. Springs around £60. £237 at a main dealer isn't going to buy anything worth getting. 
Really?? !!

The only time I have had a problem with them because of a new genuine GM A/C compressor failing within two years of being fitted, the General Manager blah blah blah
I presume this is the same place that tried to charge £320 to change a ball joint at the last MoT

I have two questions:
As your car left the factory with self levelling suspension:
1. When was it removed?
2. Was it removed correctly or did they simply pull the fuse and fit standard shocks?
Any VX dealer would know from the VIN that it should have self levelling rear suspension even if they don't know or understand why or how it works. Actually any garage would be able to find that information easily enough

That they apparently are prepared to throw on whatever is currently fitted raises more than an eyebrow.
I get that you may no longer be able to get under the car to do things, especially suspension work, (it's a bear to do even 15 years ago), but you are being led up the garden path by people that are only interested in depriving you of your money whilst smiling and making you think they've done you a favour. They haven't and they're not..
I'm not going to waste my time digging up links because you'll only ignore them and the advice given.