Brexit promised a solution just like loads of solutions had been promised within the EU framework prior to it - all these "solutions" were akin in that they were all promised (from left and right within the political establishment) and all not delivered. This is also why people seek to go outside the regular voting pattern with Reform, it's not cause they suddenly love something completely different but because the former voting pattern did not deliver improvements as expected.

What do you mean "not delivered"? The solution to too much immigration was that Boris Johnson and the conservatives tripled immigration (and >10x'ed Pakistani immigration) because they got power through Brexit.

That's not what any reasonable person would call "not delivered".

Here is the direct source: https://www.gov.uk/government/publications/the-uks-points-ba...

(note: this was not loose enough for Johnson and with support from Rishi Sunak he loosened immigration policy even further. This was just the first shot)