Land Rover Repair: 96 landrover discovery, blown head gaskets, landrover discovery

Question
my LR is overheating, i've flushed radiator,changed thermostat,by passed heater core,changed cap, it bubbles in the fill tank, is there a way to check flow through radiator?

Answer
In my experience, flushing the radiator with an off the shelf chemical rarely, if ever, cures an overheating problem or clears a totally blocked radiator. A simple test for a blocked radiator is to check the surface temperature of the radiator surface with your hand.  If the radiator is working correctly, the temperature should be hot and even all over. If portions are blocked, they will be cold to the touch.  I also would reconnect the heater and then purchase and test the cooling system with a block testing kit to check for blown head gaskets and or block failure.