I can only tell you what's generally accepted as good practice as a journalist. Which is that secret recording is generally considered a no-no unless you have prima facie evidence that something is going wrong.
So it's OK for (say) Rogue Traders to do their stuff - as complaints have been made, so that prima facie evidence exists that the plumber being recorded is a wrong 'un.
I would argue that if you have repeatedly found your views are being misrepresented, you have reason to record the meeting to illustrate your point. But I'd proceed with a lot of caution and a solicitor.