I would adjust to local time unless it was going to be a super-short trip. You'll find this would likely happen naturally anyway over a period of a few days so best to go with it
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. As you are arriving early morning, I would just go with the flow on your arrival day and let LO sleep as and when needed. I would aim to do BT at your normal time on the new time zone ie if you usually do 7pm, put LO to bed for the night at 7pm UK time. Expect some odd NWs, including to feed, for the first couple of days but just keep things dark and quiet as much as possible during night hours and get out as much as you can in the (limited) sunlight during the day. From the next day I would try to aim for your usual routine as far as you can, possibly allowing for slightly shorter A times until LO adjusts. You will probably need to wake from naps to begin with too.
On the plane you probably won't need much for LO unless you have already weaned? In which case take whatever food you may need including enough for unplanned delay of 24h plus if you bottle feed, enough for that. They should be able to provide water on the plane or you could take some pre-mixed formula if you use it. Several changes of clothes including for you - nothing like sitting covered in baby vomit - and nappies/wipes. Maybe a couple of toys and any comforters/pacis etc your LO usually uses. A blanket/snoozeshade to rig up over the bassinet if you have one. Be aware any time the seatbelt signs are on you will have to lift LO out onto your knee so may actually be worth just letting LO sleep on you.
We did UK to Australia and back for 3 weeks with a 9/10 month old. We found it took about 10 days for her to fully adjust on the way there and about 5 on the way back. That was a much bigger time difference though so hopefully you should be on track within 2-3 days
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