Hi Nichol -
I’m going to agree that right now isn’t the best time in the U.K. to visit - small matter of getting airplanes safely onto terra firma currently! But that could change and probably will. It’s a very brave man that parts with his hard earned betting on the weather here.
Look, if it’s cold and wet, wrap up, use waterproofs and boots, and if very muddy invest in a cheap pair of knee length gaiters which you’ll be able to pick up once here, at a reasonable price. This for the countryside - the cities much the same but maybe not quite as heavy duty.
You can get sunny, if freezing, days in February and they are great for getting out in. If the ground is frozen solid, no mud! Mind how you go though, frozen also means slippery, at least in some parts. Exactly how cold you’ll feel though I suppose depends on whereabouts you are coming from. I was to talking to a Finnish girl who currently lives here and somewhat surprisingly, she said she’d never been as cold - my theory is that being close to water all the time in the U.K. means the cold is damp and it gets into your bones.
Many National Trust properties don’t open until the end of March, so check before setting your heart on something. NT properties like Fountains Abbey, not far from York, are largely outdoor experiences and the abbey ruins and water gardens are open nearly all year. The paths are good though and unless the River Skell floods, everywhere should be passable.
National Parks are protected areas that exist on maps - there’s no entry fee and they are open all the time, but the remoter they are the harder they are to access if the weather is poor.
Hope if you decide to come you have a great trip, and Happy Anniversary!
Ian