Signature will have the upper hand being closer to the runway with drop & dash.
As far as LGW, this was always going to happen, the new owners have pumped alot of £ improving things and will want ROI. LTN could gain alot in the next 12-24 months even without the 'big plan'. STN is still up in the air with a fight on with Southend. Don't tell anyone but I could see 11M+.