@Blaggertyjibbet no problem — U.K. universities are v familiar with the IB and also the EB. It’s interesting as a fashion too, because about ten years ago a lot of U.K. schools and sixth forms - both state and private - were switching to the IB as an alternative to A-levels, or allowing students to choose from one or the other; and there was a lot of noise about many schools moving permanently to the IB. (For a period around 2010-15, easily more than half of our U.K. applicant pool was taking the IB, interestingly!)
For the most part, in humanities subjects this was fine, as though the style and depth of content of the IB was not quite the same as the A-level, this didn’t cause many problems for students. Unsurprisingly, the IB was quite beneficial to students going into subjects not generally studied at school - eg law, social and political science, human geography, psychology, new languages and so on.
I do know that colleagues in the sciences were not as happy with either the breadth or depth of maths and science content at either the standard or higher IB levels, in terms of preparation for science degrees. Often applicants for the sciences did not have enough higher level science and higher level maths to cope with the course content as easily as those who had done A-levels. But in my (humanities) subject, we didn’t see a massive amount of difference - but then where I am we tend to be asking for points scores of 43+ and in fact usually expect 44 or 45, which normally roughly cover 1-1.5 percent of the global cohort taking the exam (the percentages getting higher points scores increased over Covid provisions, but before Covid a score of 44 or 45 would normally put a student in the top 1-2 percent of all candidates taking the IB worldwide - one of the great pluses of the IB is that they do a very efficient statistical report of their own data each year, so you have a good sense of international benchmarks).
The trend for more and more U.K. schools offering IB has almost completely stopped since the start of the Gove reforms, the reorganisation of GCSE grading and the removal of the AS/A2 system. It’s not clear to me whether this is because of educational fashion, or whether it’s driven by schools reducing what they offer so that they could focus on the introduction of the new 2-year A-level format, or school funding issues, or DfE policy, or Brexit, or a whole mixture of things. But it’s certainly the case that universities here are well versed in making IB and EB offers as well as A-levels, and know the IB well, and so neither system would necessarily advantage or disadvantage an international student.
If your DC, say, are hoping to apply to Russell Group or Oxbridge for science or maths degrees, or very “traditional” academic subjects (history, Classics, languages, etc.), they might be better served by A-levels; but if they are thinking of more blended social science subjects, or subjects not normally done at school, or are casting their net more broadly at a range of international universities, then the IB is probably a good choice. EB is pretty similar to the IB (with a few minor differences), and either are fine, not much difference made between them, though IB has more global “brand recognition”.
On the subject of educational fashions, one which has seemed to persist in some of the academic independents and grammars is the Pre-U, which is meant to be a more in-depth version of the A-level. We do see some applicants offering a mixture of A-level and Pre-U courses. It’ll be interesting to see whether this lasts with the return to the 2-year “depth” A-level.