Planning a park visit on arrival day can be a bit "iffy". Most UK flights arrive either in the late afternoon or early evening, and it can take a couple of hours to get to the resort by the time you have gone through immigration and waited for Magic Express. Plus, in the winter months, parks close earlier, so unless one of the parks has later hours for disney resort guests, the only thing that might be open for more than an hour or so will be Disney Springs. This is quite close to Port Orleans (you can take boat transport) and has a lot of bars and street food/counter service places so you can get something to eat without being tied to a specific meal reservation time. There is also live music at many places around DS so you can be entertained even if you aren't a great shopper.