You can get them in B&Q - I've seen them in my local store before, although they don't stock smaller house plants any more which is a pain. I would also check garden centres as the often have plants that are on the safe list.. Sometimes plants come up in the weekly offers in Lidl too. Pothos' (also known as Devil's Ivy and Golden Pothos) scientific name is Scindapsus, as the people in garden centres may need the scientific name.