The 178 is a very popular flight and generally works well if looking to avoid jet lag BUT:
frankly to make it work you have to get up early and stay awake for the flight, it is a "short day" and if you can get back to London tired you will sleep well and wake up nice and early for work. I normally get home by 9-45 pretty much straight to bed and up at 6-00 feeling fine
Food offering in F more than adequate but it is full breakfast, smoked salmon salad, warm breads etc togeter with a Bistro offering of bacon rolls and a raviolli dish plus cheese and biscuits
The bar is open as normal throughout of course
The flight is rarely delayed
It is a waste of a day in many respects but for me it works