Hi there.
Maths, Further Maths and Physics as far as I’m aware would enable you to do any of the degrees you mentioned.
With regards to your question about economics - it depends on the Uni. If you would consider doing economics at top Unis (Oxbridge, UCL, Durham, LSE, Warwick etc) then whilst explicitly you would still meet the entry requirements, you would be at a disadvantage compared to those who had studied economics. But - this is something that could be pretty much fixed through a fair bit of extra reading and super curriculars, which could also show your passion for economics. You’d just have to play catch up and put a fair bit of time in to give yourself the best shot at making a competitive application (mainly needed for your personal statement).
If you’re planning to go for Oxbridge, LSE or Warwick I’d say though getting an offer would be considerably more difficult. Again, you would need to work hard over the Year 12 summer to read up on economics a fair bit.
However, all that being said - Maths, Further maths and Physics is an academically rigorous and respected combination. You’re better off doing them and getting A/A*s than doing Maths, Further maths and economics and hating it. Your chosen combination will still keep many doors open, and whilst you would be at a bit of a disadvantage for top economics Uni courses, if you really worked hard and did a lot of extra reading you would still have every chance. Good luck!