The only way which seems logical to me in order to increase Luton's capacity is to move the hangar line over to taxiway alpha while and extend the engine run up bay towards the east which could be accessed by the New Century Park. The old hangar line could be a satellite pier accessed via a bridge i.e Gatwick or an underground concourse. This is the only way I could see Luton progressing forward but like LTNMAN said, space is running out fast and the terminal can't really expand much further without going outside the CTA boundries unless Easy HQ was moved to the new hangar line.