He had backed everything up earlier....
So it's done! And I had no bits left over or anything :0)
The hardest part was putting the new heat sink paste on the square bits.... Getting it the right thickness....... But the rest was surprisingly easy! I just got half a dozen bowls out of the cupboard and put all the relevant bits together....... And it is working a treat right now!
See how long it lasts..... :0)