Yes, they were released because they were on Pye licensed labels from the States typically Calla, Wand, Roulette, 20th Century, etc. but they were not made for the Northern scene because America didn't know it existed then. Dave McAleer was the guy who was responsible for releasing the records and Ian Levine was responsible for compiling the excellent "Solid Soul Sensation' compilation LP.
Frankie & the Classicals hd previously been issued on Phillips in the UK as was Chuck Jackson's 'Any Day Now' (B-side of These Chains of Love) which was issued on Stateside.
So yes, they were issued because of demand but they were not made specifically for the Northern scene, which is my interpretation of 'tailor made', but for Black America.
Ian Levine's Evelyn Thomas, Barbara Pennington and L.J. Johnson were the first real tracks that were specifically made for the Northern scene. Others such as Wigan's Ovation were just inferior copies of existing songs and Simon Soussan's instrumentals were again inferior remakes.