In a nutshell
This is a compulsory, industry-wide change introduced by Ofgem. P272 follows on from the April 2014 roll-out of AMR (Automated Meter Reading) for all meters in profile class 5-8. These profile classes include commercial meter with variable peak load weighting.
The AMR programme made sure that meters within this category could be read remotely and could record half-hourly (HH) consumption. Now that this has been completed, P272 requires suppliers to use this half-hourly data to settle consumption accurately on a half-hourly basis. As a result, invoices will reflect your half-hourly consumption, rather than an assumed profile.