Hello MADMAX22, mikesc, Uwe,
Firstly let me apologise sincerely for not thanking you for your advice and help regarding my query 4 years ago. I only found your replies while checking out the site last night, I just don't know the site well enough even yet as it has taken me a long time this morning to find them again!
To let you know I went with the Singer 45K25 treadle machine which is in brilliant condition. It was used by a saddler/harness maker in Co. Galway (which is where I'm from mikesc but living in Kilkenny). Thanks for the manual on it. It's been invaluable.
Thanks so much.