Well, who'd have thought it? It appears Lenstore, in their greedy wisdom, were just trying it on with repeat customers. I used the "re-order" facility on their reminder e-mail, which is where the £94 price came from. However, go onto their website as a new customer, and the price for the same order is.... £68.
So, as a matter of principle, Lenstore can go and do one. Feelgood contacts have the same product at a few pence more, I am buying from them

.