There is no such thing as an online opticians as its impossible to refract/ check the health of the eye online…….that said
May I ask why you are finished with spec savers? (I am no friend of theirs)
Is it a supply issue as in they wont because either your sight test or Cl checks are not up to date (they cant legally if you havent had a CL check in the last 12 months or sight test within the last 12/24 months depending on your recall cycle and neither should the online retailers)
or is it a different customer service issue in which case I may be able to offer some advice?