Irish carrier Ryanair offers cheap flights to England from Germany. London (Stansted) from 4 German cities for only 11.98 EUR round trip!
April and May 2015.
London Stansted from Cologne, Frankfurt (Hahn), Memmingen (Munich West) and Bremen.
How to book:
One cabin bag (55 × 40 × 20 cm, up to 10 kg) plus one small bag 35 × 20 × 20 cm.