Just popped into my local Superdrug to see if they had any of the Sonicare toothbrushes on offer and to also get some new heads for my Oral-B brush.
Although they didn't have any of the toothbrushes or heads I wanted, I spotted a few of the Oral Care Essentials packs marked on the shelf for only 48p. I checked with the guy on the checkout and they indeed scanned at 48p. I went back for the rest of the packs and he followed saying he'd have one himself!
So, I got 3 packs anyway.
They are priced at £8.76 EACH at Amazon: http://www.amazon.co.uk/Braun-Oral-B-Oral-Care-Essentials/dp/B00076AEI0