I would like to comment on what you say about blight resistance in certain varieties. Orla, which most folk grow as a tasty second early, used to have impressive blight resistance but sadly, it has succumbed to a new strain of blight known as Blue 13. This strain is now widespread in UK and has knocked out the resistance of many varieties which had scored highly for resistance to older strains. The reference books and databases are way out of date and it will take some time for them to be updated. To my knowledge, many older varieties, including Gladstone and Edgecote Purple have yet to be re-assessed with the new strain. Luckily some newly bred varieties including Sarpo Mira and Axona are resistant to Blue 13. The message is - don't believe all you read about varieties with blight resistance; the majority of formerly resistant varieties have lrecently lost most or all of it.
The Sarvari Research Trust, a not-for-profit company, conducts blight resistance trials of many varieties including new Sarpo selections each summer.