Yn ystod yr Adolygiad o Wariant yn 2007, penderfynodd Llywodraeth y DU na fyddai modd cymharu'r Terfyn Gwariant Adrannol a bennwyd ar y pryd i ariannu'r Gêmau Olympaidd yn Llundain yn 2012. Felly, ni ddyrannwyd symiau canlyniadol Barnett mewn perthynas â'r arian cyhoeddus o dros £7bn a ddyrannwyd ar gyfer y gêmau, er bod cyfran sylweddol o'r gwariant hwn i'w ddefnyddio i ariannu prosiectau adfywio a seilwaith trafnidiaeth yn ardal dwyrain Llundain.
In the 2007 Spending Review, the UK Government decided that the new Departmental Expenditure Limit established at that time to fund delivery of the Olympic games in London in 2012 would be non-comparable.  As a result, no Barnett consequentials were allocated in relation to the more than £7bn of public spending allocated to deliver the games, despite the fact that a substantial proportion of this spending was to be used to fund regeneration and transport infrastructure in the east London area.