UK/EU competition policy
For that I think that we just need to look that how they regulate markets. Take for example a firm that has a monopoly. If they are not operating in society's benefit, they may increase public awareness of a firms monopoly position so that the monopoly will change its policy and say start operating at a more efficient level, i.e. by offering lower prices and increasing output. They may also set maximum levels of market share firms can have, so that new entrants can enter the market to increase competition, productivity and benefit consumers. They also make sure that safety and work conditions are high, as well as making sure that the products and services offered are at a high quality. Finally, more in terms of EU competition policy, it investigates and attempts to prevent state-aid to firms which is seen as uncompetitive and given firms an unfair advantage.
Balance of Payments
Just basically looking at what it is, i.e. difference between exports/imports. How can Balance of Payments be improved, i.e. low-valued exchange rate which makes goods cheaper and more desirable in export markets and lower inflation compared to other nations (lower costs) and what may make it worse, i.e. lowering of tariffs of foreign goods/higher wage costs in the domestic market.