As a proportionate number, those kind of movements don't gain too much support. We do, however, have a party called the United Kingdom Independence Party (UKIP) whose main aim is to leave Europe and place crippling restrictions on immigrants. Their membership sits at around 40 000 compared to our incumbent Conservative party who have 224 000 members (both 2014 figures). So no, they are not gaining any significant support, and that support which they do have, generally struggle to organise since there is such a melting pot of powerful views.
One of the most extreme parties would be the English Defence League (EDL) who commonly rally and protest against immigrants - mainly the Muslim population - which often end up with intervention from whichever police service is tasked with controlling them. They struggle to maintain one focus and tend to be 'football hooligans' who want to go out and feel the mob mentality and have a bit of a scrap with the police.
Generally it is the less affluent areas that are affected by a large influx of immigrants, this is purely because costs of houses are lower in areas that aren't filled with millionaires. Nottingham is a city that is quite well off, and won't have received the number of immigrants that somewhere like Bradford (Yorkshire) has, indeed Bradford is commonly Bradistan. So no, the situation I've described for my LPA won't be consistent, however, it will be existent in most cities in Britain.