Thanks for all your replies,

The hole is mainly at the tank end and hasn't damaged too much of the sponge but has melted the plastic frame of the seat, I could probable repair that, I think I’ll call the dealers tomorrow for a quote for just the cover. Maybe that’s the answer

I would quite like to keep it blue / black and standard so the flea bay ones at present are no good but will keep watching.

I’ll post a picture for you on what not to do with your seat when starting / running your bike through winter