Hello Steven,
If you look back to my reply to Vivian some 2 years plus ago. You will see that this isn’t uncommon.
Why change both?
Not uncommon, equates to a likelihood that the driver side rear will also break in the longer/shorter even, term. Couple this with the fact that these settle, you could end up with a vehicle which is sitting slightly off level. Obviously your call Steven.
It sounds as as if this work is being done at a main dealer ( your reference to ‘health check’). If so, I would question why not get a pair of new springs fitted at a trusted local garage, probably cheaper than the main dealer will charge for fitting one - I guess the main dealer labour rates are north of £100/hr plus VAT = £120 minimum.
Kind regards,
Gareth.