The five Pye singles I can find are

That Patterson Girl (NJE 1012) 1956
That Patterson Girl Volume 2 (NJE 1023) 1956
Jailhouse Blues (7NJ 2015) 1958
Kay Cee Rider (7NJ 2015)   1957
Trombone Cholly (7NJ 2025) 1958

Only the first two were EP's,the others being ordinary 45's.
The only other EP's I can find were released on Columbia (UK) and Decca