Pretty obvious this is an algotrading fund that has turned up with new kit and happen to be the largest player because the market has so little liquidity. 50p

Pretty obvious this is an algotrading fund that has turned up with new kit and happen to be the largest player because the market has so little liquidity. 50p says it's an investment bank or hedge fund familiar to most people who know something about this area, and the people involved might be surprised themselves to find liquidity is so low that they are market making.