The genius of the UK high pressure network is that by upping the pressure, you can store days worth of gas. This means that you can surf the daily gas market and buy gas at spot prices to pump into the network.
When I was there we had about 200 contracts with about 20 oil companies. Each contract mandated a total take with a weekly profile that had to fit the rig maintenance schedules. If you breached the figures you paid more for the gas.
The whole process began with a series of Telexes* from 8 weather stations with the airport weather forecast. (Because it was a set format). This was put into a program which worked out the estimated gas take per offtake, and what gas was needed at what terminal to achieve this with minimal compressor usage. (When a compressor station is a couple of Rolls Royce RB-211s,they take a lot of gas).
After that the whole matrix was mashed through a contract optimisation algorithm that created a shopping list of how much gas from which supplier under which contract. That was then used to create Telexes to the offices and oil rigs for 6pm as per contract requirement.
In my time, I saved £25,000 as we connected (via the PSS X.25 network) to the met office, thus saving 8x4x365 telexes a year.
*Ask your grandparents