Strongbow / Wrongbow. Vile stuff. That said, whilst it dominates across much of the country as the draft 'cider' offering, it's been fairly comprehensively been kicked out of most of the Westcountry by Thatchers Gold. Except in Cornwall, where 6% Rattler is normally the offering. Possible that Stowford Press is big in Herefordshire and Aspalls in Suffolk, but I haven't spend enough time there to judge. Probably have Magners to thank for changing the image of cider so some folk from beyond the Westcountry and the Marches drink it.
Ciders themselves are a very diverse breed, from fizzy mass market brands to flat room temperature scrumpy which gives you a six pack due to your stomach clenching every time you consume it, to halfway houses such as Old Rosie, but most pubs only seem to have one draft cider on tap. Shame it's often Strongbow.
Regarding lager, it does annoy me that what is considered premium lager over here is just considered lager abroad. Quite tricky to find Budweiser, Carling or Fosters in Germany - what a shame. Germany seems to have a very regionalised setup when it comes to lager.