If you take as much care of your engineering work as you do of your posts on Eng-Tips, feel free to work anywhere where I won't be affected by your lack of attention to detail. Ideally stay out of the UK because our industries have enough problems already.
You might be the best engineer in the world, but based on what we can see here your work is sloppy and you don't bother to check for errors. It might seem trivial, but it is the only thing we have to judge you on. In my office, letters riddled with mistakes go in the bin. Written reports with errors are treated with utmost suspicion: if the grammar is lousy, why trust the data or the calculations?
Sort your problem out if you want to improve your chances of getting a better job.