This one should work because the voucher code is posted and approved on the cashback websites e.g.
In theory, you shouldn't get cashback when using a voucher code. Hope it works for you.
And cashback from Topcashback or Quidco tracking at 14.85% (new customer) or 11.55% (existing customer). Tracked for me at £55.09. Can't beat that!
Sorted now. Be sure to use code HOLIDAY2020 not the one indicated on the Olympus offer page
Tried checking one out but no discount applied and code not recognised. Page still showing deal available, but may have sold out?