Here is what I have in my database:
UF55 A0001 to UF 55 A151 (none sent to Ireland)
UF55 A 47 Used, set up with a Parker Hale No 5C, located in New Zealand
UF55 A 49 Used, modified to 7.62 target configuration, in Canada
UF55 A 52 Used P-H regulated, in NZ with replacement 2 groove barrel
UF55 A 73 Used, P-H, Regulate4d by Fulton, in UK
UF55 A 86 Used, converted to heavy barrel (in Canada with sales mark)