I was unsure if that was due to the lack of jobs in Poland, or for a higher wage offered in the UK,
Both. Jobs are tight and wages are low, and there's plenty of people who are willing to work for peanuts. There's little point in moving to Warsaw if you are not going to earn a decent wage.
she has a decent job in warsaw and I wouldn't want her to give that up to come over here and end up in a low paid, dead end job
Her chances of finding a good job at good wages in the UK far, far exceed your chances of finding same in Poland.
I may have to go down the teaching English route for a while
Your chances of finding gainful employment are higher as an electrician than as an English teacher in Warsaw, the most competitive market in the country. There are scads of wannabe English teachers in Warsaw, many much more qualified than you. Sorry, but that boat has sailed long ago, and even established teachers are having a hard time of it. The best you'd be able to find is a lousy job in a lousy school for lousy pay under lousy conditions. Without solid qualifications and experience, the good jobs are out of your reach. If you're thinking about private teaching, forget about it. The competition is far too stiff, and the rate you'd be able to earn is far too low to make a move even worth considering.
end up in a low paid, dead end job, as this will eventually make her feel miserable and cause problems.
Believe me, you are going to get tired very quickly of ending up in a low paid, dead end job yourself. Especially if you can barely provide for yourself, if at all. And she will get tired of it, too. Especially if she has to support you.
Sorry, but barring getting hired by a western company for western wages, I don't see much hope. And generally, those jobs are for highly qualified, highly experienced professionals, not for ordinary electricians. Give it a try, but don't hold your breath, and make your plans on the very safe assumption that you will not be able to find a good job at decent wages in Poland.
Basically, the ball is in her court. If she is not willing to relocate to the UK, it's probably not going to work out between you two. It might be time to consider whether this relationship has a future, and whether it is worth investing more time in. What kind of job does she have in Warsaw? And how much is she earning compared to you?