The Stock Exchange guideline that requires brokers to undertake a deal for a client at the most useful price available for sale. The concept of most readily useful pricing is hard to establish. If a broker thinks the marketplace is falling, as long as they hang on before purchasing? Brokers possess some discernment but, in most cases, they perform deals straight away (just as much for their very own protection as other things). Timely execution implies carrying-out the deal within 20 mins of getting the customer training.