your vocabulary is fine. your active vocabulary needs to grow. that's why you can passively understand most of what you read and hear. your production of the language is what you need to improve.
It's going to be really tough for the next government to get out of this hole. god forbid the labour party don't manage to make significant steps within one term.
Bug is supposedly a Welsh origin word that is spelt bwg. and that's the limit of my knowledge