I've travelled a bit since my daughter was 6 months, so here are my tips.
The pram is usually counted as an additional piece of luggage, but not sure about the portable cot.
For your daughter I would still ask for the bassinet, as children usually fit them until about 18 months. The problem is getting them to willing stay in the bassinet. My daughter loved it, however my son would wake as soon as I put him in. I always bring a wrap/blanket and 2 pegs to tie above the bassinet.
Food and bottles - depending upon how well your daughter is eating you can ask for a child rather than infant meal when booking. I always bring extra food and snacks. I take sufficient water to last for 2 formula feeds and also take a spare empty bottle which I fill using the water dispenser. By the time I'm ready to use the water in the spare bottle it's no longer cold. I take lots of formula and and bibs.
Hand carry - you need a very large bag. Bring lots of diapers and wipes, spare clothes for your daughter and atleast a spare top for you. I put only a few in my bag the remainder in a trolley bag. Important even if you dont't use it, is to bring some medication to settle your daughter. At 1 she will be easily enterained with her favourite toys, books.
Baby Carrier - I find this essential as you will be probably up and walking about alot, it saves your back and allows you 2 hands. If you're travelling alone it is definitely essential as going to the bathroom whilst holding a child gets really difficult!
If you hadn't planned it yet, change your daughters sleeping times before you go. Each day adjust her day by one hour, so by the time you arrive in the UK your daughter will already be adjusted the the time zone and you can make the most of your time there.
In general, I dont't rely on the airline staff for too much as realistically they are not looking after only you and your daugther but a few hundred other passengers too, so even if you have a screaming child you need to wait.