Set fire to it and claim the insurance

[ceegee]

Ok all the evidence points towards a blocked heater matrix, pump OK,Duo valve OK, new thermostat, etc, tried the unblocking solution, no difference, the local garage said it would cost more to replace the matrix than car than it is worth, so do I do it myself? seems a massive job, can anyone advise the procedure, or do I set fire to it and claim the insurance.
Hurry before hypothermia sets in