Assuming that the whole 150 metres extension is available for take-off, that will give a 1800m TORA for runway 20. CAA may however insist that it is published as 1799m to stay within Code 3 runway dimensions (due to the runway width, ie less than 45m). That's 61 metres better than SEN, albeit SEN doesn't have the same obstacle problem off the end of the runway.
Could the future be orange?