I have my first F next week. Have already booked a cabana for some of the layover at LHR (approx 6 hours) and have appointments booked at the Elemis Spa. Timing wise should be able to grab a late breakfast in CCR and late lunch/early tea. Will then, hopefully use dine on demand to push back the meal time on board so no need for a meal when we land in BOS. Apart from telling CC on board that it is our first F, not sure if there is much else to do - apart from trying to get our buggy on board to save gate checking it!