Any British person who has the skills which are necessary for Poland will find a job, even if their Polish language skills are minimal.
The general rule of thumb, the less Polish skills you have the better your other qualifications have to be.
There are thousands of jobs in Finance (as long as you meet their requirements).
Which probably mean keeping abreast of regulations which are in Polish (English translations of Polish laws are notoriously awful and not to be relied upon).
Poland is not for ex-pats who just want to bum around.
Unless they don't need to work in Poland (because they're independently wealthy, or do telewok so their location doesn't matter, etc)
But yeah, showing up, even with some marketable skills, with no knowledge of the language or culture is not gointo lead to employment for most people.