Got an email from Weird Fish, there is up to 50% off on 327 men's clothing clothing, and also womens and kids sections. A lot of stuff is also 30% off, and you get free delivery too, although it is too late to get it in time for Christmas Day. 90 day returns too.
Although there are some items I liked that certain sizes were sold on, there's still a large choice that have every size available, so worth a click.
There's 2.2% cashback on Quidco and TCB.
Their Fit Finder is quite a useful tool, but I can't guarantee its accuracy.