I studied Physics, Maths, Geography and Art at A-level for Structural Engineering (Maths and Physics were essential, further maths would have been a bonus, but I wanted some variety, and chemistry would have been no help at all for my degree, although I did consider it as I enjoyed the subject at GCSE).
My Uni had a maths test in freshers week and anyone that didn't pass had to have extra maths lessons the first few weeks. Fortunately I passed - most people that failed probably only failed because it was freshers week so they didn't take it seriously (since everyone had to have got an A grade or equivalent to qualify for the course - this was back when this was the highest grade it was possible to get).
In first year we had 2 modules (1 per semester) that was basically a combination of refreshing A-level maths, teaching most/all of further maths and some fundamental "university" level maths. It was a joint module across all the different engineering departments and gave a great foundation to bring everyone up to the same level. Because I hadn't studied further maths a lot of the content was new to me, so my friends who had studied further maths were at an advantage. However, we soon discovered that because we had taken A-levels from different exam boards, some content had not been covered by all of us before anyway, regardless of which subjects we had studied. That was the point of the 2 modules, to bring everyone to the same level knowledge-wise - after all you not only have people from all over the country who have studied slightly different syllabuses, but also people from all over the world who have different qualifications altogether. Certainly speaking amongst ourselves we couldn't find two people who had previously learned all the exact same content before university. I had done mechanics while others hadn't (there were even things I had studied that my friend who had done further maths had never hear of!). I don't regret not taking further maths as after those 2 modules we were all at the same level anyway. Taking further maths would be a good idea if you don't fancy learning a lot of new content in your first year, but if you're confidant you would cope fine then it's not a problem not to have done it.