Smiths heater control valve

[Kevin H]

Good find David. It's the same as the one on my 411 S5 (see photo), before I fitted air con. It seems the price can vary quite a bit, so it's worth shopping around.

Chris, make sure you don't undo the two small bolts that fix the bracket onto the heater body - the nuts behind them are not captive!

If my memory serves me correctly, the job will be easier using small BA spanners.