I looked into it mate. When the debarcle that was the network sell off started some lads on my side were transferred to UKT for Grid and some were left as part of the DN as the 'assets' for the sale. I was one of them lot...
When the sale completed and it became evident what the new owners wanted... i.e contractors doing the work and subbying work out ad-hoc they started to reduce direct labour workforce.... they then lost the domestic and non domestic metering contracts to Enterprise and PH Jones respectively...
Loads of us applied to go to Willows and other firms but they didnt want anyone so evetually loads of us left for other jobs as we saw what was going on with under-investment in the plant and equipment and knew we'd get blamed. I went to BG as had my ACS anyway because, even though its madness, we needed it to work on water bath heaters and pre-heaters on the pressure reduction sites, So understandably I'm a bit of a biff on domestic.... fit in well at BG then
Unfortunately in this climate there isnt much demand (up here anyway) for HP qualified fitters, especially when you only specialised in governors, gas holders and gas transmission equipment - except with the DN's!!!
Biggest meter I saw was an old rotary meter at a paper mill, flange connections were 36inch... thing was about 13ft high and ran on intermediate pressure (3.5bar), index was knackered, that was a fun job, crane had to lift it out!!
Higher pressure ones were generally smaller, but still massive!!!
Eg
View media item 16200 View media item 10562
Some tin case meters were big though
View media item 10558