A bit of a conflict of images there, a masked and muscled-up tough guy, with a serious weapon on.. a bicycle??
I believe you have struggled with the cutting discs because it looks like you are using an imperial size disc, a metric one would have this job jobbed in minutes. If you take the unused discs back, I`m sure B&Q will gladly swap them for metric. I take it you did try unscrewing the sprocket first, right hand thread I believe ...................
One good thing is your partner will feel secure in your relationship You cant pull a sprocket so you would never pull another bird
When the wife starts making dry comments about it being the only thing stiff and it'll be the only thing sticking around
We're out of ideas. I was done when you cut the sprocket and a flat screwdriver in the cut and then twisted, wouldn't work.
Are the splines on the shaft damaged? Could you have distorted the sprocket when you used a puller, and now the tabs on the inside of the sprocket are jammed tight on the splines? If so, my only suggestion would be to cut across the face of the sprocket, as close to the shaft splines as you can, then the remaining sprocket tabs can be "GENTLY" tapped out the splines with a small drift. Hope that makes sense.
Come on Evo, how would you tackle it? this thread needs a fresh perspective - could a barrow be involved?