The discounted cash flow (DCF) for 4 FTSE 100 companies

Literary Calculate the discounted cash flow (DCF) for 4 FTSE 100 companies (BP, UnitedUtilities, Marks and Spencer, Barclays) to value and compare their assets performance from the period October 2017 to January 2018 and explain why this may deviate with it. Using your judgment explain how confident you are with the input used in each of the calculation leg, growth rate, number of years, WACC, etc) and provide a table with the formula and input. (Use GBP as a currency and convert dollars to pounds if necessary) “5