Spectacles from Specsavers

Okell

https://forums.moneysavingexpert.com/discussion/comment/82053740#Comment_82053740

I think you may have missed the point?

It isn't that they are not fit for purpose, it's that if the dispensing optician(s) at SS were exercising "reasonable care and skill" in fitting the spectacles, then they would not be slipping down your nose.

The exrcise of reasonable care and skill is something SS must demonstrtate under s49 of the Consumer Rights Act 2015

Go back to SS and challenge them to fit your specs properly

Alderbank

This ^^^

Dispensing optician is a highly regulated profession. Practitioners must be registered with the GOC (General Optical Council) and carry out their duties in accordance with the Optician's Act 1989.

This includes, among other statutory requirements:

1. take and record facial, frame and other appropriate measurements before ordering the spectacles, check that the spectacles are marked with CE or UKCA, and conform to the relevant standards131
2. 
   check that the spectacles correspond to the written prescription or sight test record and fit the spectacles to ensure the correct plane, height and position
3. 
   check the spectacles on the patient for fit, comfort and function, making any adjustments before the patient takes them away

Did your Specsavers practitioner do all that?