As of today Wizz Air Group has 114 aircraft (10 at WUK) and will have 120 in a few weeks (vs. 476 at FR and 327 at Easy).
However the difference in seat capacity is a lot smaller (Wizz already operates ~40 321s with 230/239 seats vs. lower capacity 738/319s at FR/U2) which will decrease further as nearly all deliveries from now on will be Y239 A321neos (while even the MAX will be only Y197). IMHO Ryanair should already call Wizz competition with like 150 daily flights to/from the UK and a lot of common bases.