If you want to save money you are going to have a look at all your outgoings and see how you can cut them down.
It's worth ringing all services and letting them know you need to reduce you bill with them or cut off the service. They would rather keep you on a reduced rate than lose you completely. I did this last year and cut almost £100 off my monthly outgoings.
Go through your freezer and see what you have and either throw it or use it. Do a food plan for the week and only buy what you need. £200 a week is a lot for a weekly shop. How much are you throwing away?
Stop buying any food or drink outside the home. Go without or take it from home.
Knock takeaways on the head (we never have them - I can't believe how much money people waste on them on MN)
If you haven't already got one, get a credit card that gives you cashback when you use it. Make sure you have a Nectar, Boots and any other loyalty cards for shops you use.
Clear out your wardrobe, toy cupboards and shed/garage and see what you can sell on local Facebook groups selling pages.
Cancel any subscriptions you're not using. Have a look at how often you go to the hairdresser - can you stretch to a few weeks longer in between? If you dye your hair can you alternate a home treatment with salon treatment?
Walk more! Spend less on fuel.
Cancel the window cleaner - do it yourself!
Ditto the cleaner.
You sound like you're in a pretty strong financial position. You may be able to get another job as healthcare sector is one of the few that is booming - worth calling recruitment agencies to find out?