I would give this hotel a rating between 3 and 4.
The hotel building is lovely, it is a former country retreat of a baroness. The grounds are also beautiful, I felt that the surrounding gardens could be maintained a little better. If you like military history, definitely stay here as it was the home of the 617 Dambusters squadron during WWII. As for COVID implementations, they have a one-way system in place and you are required to wear masks in the building. I booked a standard room which was nice and clean. We didn't have much of a view, our windows looked out to the bins which was a little disappointing. I like to sleep with the window open and it was quite noisy late at night outside our room which woke me up. We ate in the restaurant in the evening, prices were very reasonable for a hotel. The food was nice and the service was good. We also had breakfast in the hotel, it costs £15 pp and you get tea/coffee/juice and then something from the cold and hot options. If you just want a coffee and a yoghurt, the breakfast isn't worth it. However, if you get a full English, coffee, juice and a pastry, then its worth it. On check out, the reception did try and charge me an extra £30, which was incorrect. Make sure you always check your bill and work out your charges as hotels do make mistakes. Overall, I think that I would stay here again, I am perhaps nitpicking a little in my review.