The best-tasting apricot varieties won’t survive well in the UK because they are adapted for arid climates. Most US commercial varieties are developed for California because that’s where they are grown. Quality breeding programs also need to incorporate genetics for disease resistances and (if applicable) frost resistance.
Better varieties for the UK will be those those that perform well in the Pacific Northwest and New England. Top picks by growers here are OrangeRed and Tomcot flavor-wise, and, for hardiness, Hoyt Montrose, Alfred, Puget Gold, Rutger’s releases, and the Harrow Series.
Bob Purvis is on of the foremost apricot experts in the world and can help you identify varieties that have performed well in the UK. You can contact him by email.