While the UK is 50% self sufficient in gas, storage of gas is bad.
In the market you use reserves to mitigate shortage and create “extra supply”.
In the following link there is a chart with storage capacity: https://www.bbc.com/news/business-58637094.
Nevertheless, someone is speculating big time!
Is it Russia, to put pressure on Germany and EU to approve/certify North stream 2?
It is completed but not “certified” OR
is everyone counting that when NS2 gets done, gas will be even cheaper and not buying reserves on “high price”?