The key "locks" into the appliance - This is normal so don't fear...
1) Ensure the knob to "fill" has been turned "off"
2) Place a gentle (Keyword = Gentle) downward pressure on the key
3) Whilst pulling down; twist the key 180 degrees
4) You will feel it engage two slots and drop slightly
5) Give it a wiggle and the key should come free; there will be a slight amount of water loss at this point - Don't fear.
GasAid.co.uk
January 2007