I've used them a few times, don't use them any more - some of the 'quality' parts they sell are just reboxed shonky Chinese crap, and they have no qualms about it. It took me three months to get a refund on a L319 lower steering column that was returned to them as substandard / dangerous, they were not interested in the (lack of) quality, it was essentially a fleabay-quality part with a 120% markup. I know others that have had similar experiences.
For the rear wiper, personally I'd get one from a fleabay breaker with warranty (~£40) and order the repair kit to fit when it turns up.