hello all...i would like to share something I found...it is an anodized aluminum coolant tank bleed screw...now you can tighten with no worries...it is available on ebay from a store called bp*utah....it is ditributed in the UK for European members to buy direct....i just put mine on and eliminated my very slight pressure loss troubles and slight coolant smell...if a mod would like to somehow make this post available to all relevant forums for all who have this screw, that would be great....here it is...about 20 bucks on ebay...maybe less from the britpart store...they also have a lot of engine parts that fit both jaguar and landrover....hopes this helps someone like it did me

expansion tank bleed screw in aluminum

 

Thanks for this.

 

Good find!
Thanks for posting as it is really needed too!
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Quick update...with the new bleed plug i have a first...in 3 plus years of ownership, until now, this car always had a faint to strong coolant smell when parked and shut off....from everything like a split radiator to the final fix of the bleed plug...now it just smells like hot metal....what a long journey to success.....moral of the story....trust your instincts and dont give up