Thanks Swanhunter. BA's site says they are in the process of updating WT+ on the 777's so I wasn't sure about this particular one but if it's the same product then I'll just choose the time that suits.

I come back from another work trip on a Saturday and have to fly out to Sin on the Tuesday. I want to try and fit in a day with a UK client and it would suit me better to do that on the Tuesday and go straight to the airport and keep the Monday for myself. A 7pm flight would mean leaving a bit too really but 9pm means I can work till 6pm.