The main issues you'll face are wind, wet and a lack of sun. Dwarf varieties are typically half the height of normal hops so need much smaller structures to support them, but the only one that's readily available is First Gold (often sold as Primadonna). It's a great hop to start with.
Hops are thirsty/hungry plants so they like lots of water and deep rich soil, but they don't like their crowns to get wet, which is why they are traditionally grown on "hills" (small humps of earth) just to allow water to drain away from the crowns. Wet is more of a problem from a disease point of view, particularly downy mildew, you're better off with one of the more modern strains which have better disease resistance than the traditional varieties. Pilgrim is pretty good from that point of view and gives good yields, but maybe isn't the most interesting to brew with - Centennial might also work well for you, just don't expect US varieties to be as intensely fruity when grown in the UK, they really need intense sun to develop those flavours.