Jobsworth 400 Lumen USB front light (Moon Meteor copy) and 60 Lumen USB rechargeable bike lights £21.93 delivered @Planet X
£9.99 + £7.99 + £3.95 postage
I own both these lights and for the money it is hard to find fault. They are both very good quality for the price. The rear light is ridiculously bright. Only fault is that it can only be attached to seatpost and bit of a pain to remove but minor criticism.
Think they do free delivery over £75 and if you scour their unpleasant site it's easy to do!