All sorted now
after many hours :x
Tried soaking with coke, nada. (Great idea though, what on earth was the first person that tried that thinking?)
Perry, loved your idea of using a stem, small yet never the less fatal flaw, the inside of the seatpost was too narrow. Bugger!
Tried pipe grips, they just slipped.
Nothing else for it. 3 hours with a hacksaw blade and I managed to cut it in half from the inside. Thanks for all the suggestions folks!
I have now added a 26.2mm seat post to my wants list
Tinkety tonk!

Tried soaking with coke, nada. (Great idea though, what on earth was the first person that tried that thinking?)
Perry, loved your idea of using a stem, small yet never the less fatal flaw, the inside of the seatpost was too narrow. Bugger!
Tried pipe grips, they just slipped.
Nothing else for it. 3 hours with a hacksaw blade and I managed to cut it in half from the inside. Thanks for all the suggestions folks!
I have now added a 26.2mm seat post to my wants list

Tinkety tonk!