Heathrow Terminal 5

If you are flying British Airways from London Heathrow, it is likely you will use Terminal 5.
This new-ish cavernous, light filled building provides a welcome change to some of its smaller, depressing neighbours.

ACCESS BY CAR
I was lucky enough to have a parental chauffeur and parking is plentiful.  There are designated parent & child spaces near the lifts.

CHECK IN
If you are travelling with an infant, you can't check in online.  Despite numerous check in desks, most of them are marked 'Bag Drop'.  You need to head to 'Assistance'.

SECURITY
If you look fraught/sad/needy enough they should usher you through to a Family Lane.  Make sure you remove any unnecessary liquids as they could bin your Aptamil/food pouches if you're unlucky

SHOPS & DINING
We had a relaxed and delicious dining experience at Giraffe open 0500 to 2130.  Friendly staff with a great Kids Menu.
If your kids are behaving, there are some great shops at T5, for list see here http://www.heathrowairport.com/shop,-eat,-relax-and-enjoy/shops-a_z

PLAY AREAS
I didn't get the chance to explore these (too busy buying vodka) but apparently there are softplay areas located in the departures concourse, after passport control.

Allow yourself plenty of time to get to your gate as some require a link via transit train