Did you do it with the inlet in place or remove it?
Most Defo don't take the inlet off!
Take off the water hose to the thermostat housing, take off an 8mm nut on a cable bracket on the alt and use a wobbly ended 6" extention with a shallow 10mm (single hex 3/8 preferably but I've used multi hex in the past) take out both tens, pull out old one with seal, moisten the new seal with coolant, refit thermostat (brace almost vertical) , then seal then housing, bolt it back up, cable clip back on, hose back on, slightly overfill water tank, put the cap on! Run the car, heaters off, at 2k rpm for 3 mins, then idle till the fans come on, check heaters are hot, switch car off, allow car to cool, till top rad hose has lost all pressure, then top up,
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