thankyou all for the replys and advice , havnt been home much this week to do much and been bad weather too ! should know more about it as soon as time permits and couldnt find anything more in the way of numbers , this one has a large knurled top too holds the lead on , and yes i know not to pull it apart

if its not broke
n i wont fix it . cheers Dave would the only id be on the brass plates ? as one is missing a quick look at night and couldnt see any other numbers anywhere ..the 'plug from it compared with a standard , came out freely with a copper washer as a gasket never seen one up close before ! 18mm too i think ?
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on it says , made in england on the ceramic stamped on the metal , LODGE----H1 . not yelling , how its stamped .cheers