The United Kingdom aims to reach carbon neutral target by 2050, corresponding policy and regulation changes is attracting significant investments in clean energy generation. Nevertheless, introduction of more distributed renewable generation, with its inherent intermittent nature, will make grid balancing more complicated and costly, particularly for large consumers that rely on electricity to provide products and services. On the other hand, the UK power grid is already tested to its limits during a harsh winter (temperature below -5C) with more strain to come with the electrification of heating and electric vehicle charging. An increase in flexibility is necessary to mitigate potential mismatches in supply and demand induced by these changes. Flexibility must be harnessed not only on the supply side but also on the demand side, an approach that is referred to as demand-side flexibility.