BHX has nothing to Poland from Wizz anymore. There has been Warsaw, Poznan, Wroclaw and Krakow over the years but despite rumours of WAW and WRO returning it's still a blank.
In fact, Krakow aside, Poland out of BHX is a shadow of what it once was. Ryanair have chopped Katowice and Gdansk in recent years with both remaining unserved, although Poznan and Lodz have been added. Warsaw was also totally unserved for much of 2025 (Modlin returns in March).
Contrast that with Romania where Ryanair and Wizz have around 10x weekly flights to Bucharest between them with Wizz also serving Suceava, Sibiu, Craiova and Timisoara.
These things do tend to go in phases though so hopefully things will pick up for UK airports to Central and Eastern Europe in the future 🙂