Renton.
Weigh yourself once a week, same time same scales. Record the weight, don’t lie don’t skip.
SORT out your eating. It’s all about the pies Renton. Cut out the treats, sugar mainly. Eat whole grains etc.
As for exercise why not just try walking, 3 mile walk every morning 7 days a week, keep that up even when you get back, but stick to it. It’s not high impact so you should be fine with it.
Give yourself time to loose the weight and adjust to your new eating, well over a year. You should be targeting 15stone or less at your height.