An interesting article on Wizzair:
Wizz Air: why Europe’s second lowest cost producer may be looking for fresh capital: IPO time? | CAPA - Centre for Aviation
Says that LTN is their largest operation (would they wish to upset that by moving it elsewhere?) with 63,360 seats per week, 36% larger than Budapest, in at number two.
It also says that at LTN, EasyJet is number one with 47.9% of the seats, followed by WZZ (27.8%) and Ryanair (17.1%). No surprise there!