You will connecting from T3 to T5 by airside bus. Don't hang around as there as a strict T-35 deadline for arriving at Flight Connections within T5 (so 0815). If you don't pass this point by 0815, you will be rebooked on the next flight (the following day).

Use the Galleries Club NORTH Lounge, it is immediately after you clear security on your left. It has a decent breakfast, there are showers.

The LCA flight usually leaves from A10, which means getting bussed to the plane. Nice. We know. Sometimes it goes from a B gate.

IMPORTANT: Change your seats now to 12DF. You will have the middle section, with a little space between the seats AND you have a bulkhead in front of you. No bassinet, but enough space around you.

The front 3 rows are reserved for OW Emeralds until 3 days before travel. If still free, you could move forward to 1DF or 2AB or 2JK at this point, but I recommend 12DF. For your return CE doesn't yet go back beyond row 9, so perhaps 9DF would be best at the moment, with a chance to move to 12DF or 12AB or 12JK if the CE cabin extends back, or to 1DF or 2AB or 2JK at 3 days before travel if still free.

It's a long flight. The IFE never works, so bring a book or a portable DVD player/iPAD if you want to be entertained.

Arrival into LCA is nice and easy, you exit from both door 1 (row 1) and door 2 (row 12) via dual airbridges into a nice new terminal.