By Susanna Twidale LONDON (Reuters) – Measures to help shield consumers from record high wholesale energy prices amid high inflation and Russia’s invasion of Ukraine look set to dominate an European Union summit later this week.[L3N2VL2CK] Below outlines some of the policies Britain and European member states have already announced: BRITAIN Britain has a price cap on the most widely used household energy contracts but this is expected to rise by some 50% in April. To limit the impact the government has announced a package of measures, including a 200 pounds ($263) discount on electricity bills…