Greetings Philip, I know nothing about St A's except that businesses are planning for an Open every 5 years. Adrian's suggestions of using the years 2 and 7 making every Open there an anniversary date, makes sense.
Adrian, I have friends who visited Lytham last year and members were insistent they were off the rota, as the R&A believe they haven't sufficient extra space necessary for merchandise, media etc. You are correct that the agreed with Stormont plan, is for a quick return to Portrush. In NI last year the belief was for 2024 but things are different now.
2023 is the Centenary anniversary for Troon and much was made of that by the R&A, when they announced in Feb 19.