(This is a Problem Question of Consideration chapter in Contract Law, need a Solving in 1200 words with given case names or references and Lords or Justice names) According British law. University of London.

The Nice Girls are a successful pop group. On 1st January they enter the following contracts: a) With Simon, to act as their manager for a year at a salary of 100,000. b) With Whinger, to join the group as a new singer at an annual salary of 300,000. c) With Edith, to act as Deputy Sound Engineer at an annual salary of 30,000. All the contracts further provide that they can be terminated by either side with one month's notice. On 1st February the Nice Girls offer to pay Simon an extra 50,000 after they hear a rumour that he wants to leave them to start a TV show. At the same time, they tell Whinger that they are disappointed with the public reaction to her joining the band and so they want to reduce her salary to 150,000. Whinger agrees because she thinks the group will otherwise terminate her contract and she needs money to pay for her boyfriend's drug rehabilitation programme. Also on 1st February Edith says she wants to leave immediately unless she is paid more money. The Nice Girls realise that protesting will make no difference and cannot find a replacement before their World Tour begins on 1st March. Therefore, they agree that Edith will be promoted to Chief Sound Engineer at a new annual salary of 45,000. The World Tour is a great success but when it is completed on 1st June the Nice Girls tell Simon and Edith that they will no longer pay them the increased salaries. Whinger is demanding to have her salary paid at the original rate and says she is entitled to the balance of the 'underpayments' made for February and March. Advise the Nice Girls.