There are electricity charges (341.33) and standing charges (60.40 and 3.28) in all bills. You also have a day meter (645 and 40) and a night meter(32 and 511) which charge different rates per unit. The reason you have 2 unit readings on each is because your price changed mid-billing period. The reason there is a third reading in both is because your meter changed and started back at 0 for the smart meter. If you add all the figures from Total Electricity charges to second VAT you should get 239.37
At the top they just show total electric less gov credit, total Vat and total discount from below.
Btw, your previous bill was a whopper. Make sure and change your supplier to the best rate each year.