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I think early gas holders had a fixed storage container. Basically an upside down glass in a bowel of water. As the space under the glass has gas pumped in the glass rises. This requires a hole in the ground as deep as your glass is high when full.
Telescoping gas holders have a series of rings that fit inside each other so your gas holder can go a lot higher than the depth of your hole.
Sounds like they got upgraded.
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At a guess it's when they were originally built as rigid types (that didn't expand or contract) and then converted at the later date to telescoping types.
jellybaby
Greenbank
@aggi
Looking at the gas holders around Kings Cross they all have two separate dates for erected and telescoped. What's the difference between the two, the telescoped date is often 20 years or so after the erected date?