Assuming you are skilled and equipped to survive on the hills in the current UK weather, the use of Snowshoes can make progress more rapid and easier.
They are not very popular in the UK as we don’t often get the “right type of snow”. But when we do they are great.
The French sports retailer Decathlon carries a variety of models. For most use the “cheap and cheerful” end of the market is perfectly adequate.
They are not designed for steep slopes, but the metal rails and grips will deal with a surprising variety of surfaces, including ice.
The bonus is that they are easy to learn to use, unlike something like cross country or mountaineering skis.