I can't recommend anybody specifically, but would urge you to educate yourself to the extent you can
before selecting an advisor. If you already know the right answers (or the constellation of possible right answers, for the cases where it's not clear there is only one answer), then you can tell who will actually provide you useful advice, and who will take your money and provide advice you could have figured our yourself, or even worse, is wrong. There are plenty of "experts" out there who do not understand the full picture of both the US and UK systems.
As far as educating yourself, a few suggestions:
1. In my opinion, the best primers for the topic are on the Bogleheads wiki. A few articles to get you started:
https://www.bogleheads.org/wiki/Investing_from_the_UK_for_US_citizens_and_US_permanent_residentshttps://www.bogleheads.org/wiki/Taxation_as_a_US_person_living_abroadhttps://www.bogleheads.org/wiki/US_tax_pitfalls_for_a_US_person_living_abroadhttps://www.bogleheads.org/wiki/Investing_from_the_UK (must read with US taxation in mind, but provides an overview of the UK system)
2. This board and the Bogleheads Non-US investing board (
https://www.bogleheads.org/forum/viewforum.php?f=22) both have a number of well-informed people. Ask questions and you will get some answers - possibly with some disagreement, but that's the nature of some of these questions. There are some good groups on Reddit and Facebook too, but I find you need to weed out mis-informed answers more on those platforms (not that here or Bogleheads are necessarily professionals or 100% right!)
Once you have the free, non-professional answers to your questions, you can narrow down the ones where you want to pay for professional advice.
Off the top of my head, 529s and non-reporting funds are both questions you will get good answers to. UK treatment of US revocable living trusts may be so specialist that you don't get a good answer and you need to pay for guidance, but you'll probably get something to help you be informed.