A cracked plug socket which I use a lot for fan-heater.

That depends if you suspect correctly.

The fact that you will have fitted a new plug (it's strange no one has suggested that) might cure the problem; not because it is surge protected. That's not what a surge is.
 
If as I suspect the thing that's caused this socket-burning is the dodgy fan-heater...what would happen if i was using a dodgy fan-heater but with a surge protector plug?

I doubt the fan heater is dodgy. it is probably built to run at 3kW, there is not much it could do to use more for long. The fault is more likely in the plug terminations.

You might consider buying a 2kW heater or even 2.5kW if such a thing is available. I use oil-filled radiators, they have an internal thermostat and (in my usage) do not run continuously, the plug never gets very hot.
 
To prevent this from happening in the future would a SOCKET SURGE Protector work?
The heating effect in your failed plug is absolutely nothing whatsoever to do with any form of surge. The problem in this instance is a prolonged continuous heavy load which by design heats the fuse, the heating and cooling effect anneals the copper or brass fuse holder and the longer the process continues for the softer the contact becomes until it no longer makes perfect contact with the fuse. At that point the higher resistance...
Would you like me to continue?

Just replace the plug with a good quality item and now the new socket has suffered mechanical damage that needs replacing too.

That's it, no frills, no spills, no pointles additional accessories.
 
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