Ohhh, Scotland! I have always wanted to visit. That is the home of my family originally (unless one is native American, all Americans have family roots somewhere else).
I started physical therapy with a 10 degree bend of the knee, with the doctor asking for 90 degrees within 5 weeks. I was able to do it. I worked with PT and in my own time I did leg slides. On a bed, several times a day, simply slide the heel of your injured leg towards you as much as you can, then control slide back down. Again, heating the knee and muscle relaxing helps before doing this.
I noticed that I would seem to plateau with no advancement in ROM or strength, then one day…BOOM…I could move my leg much, much more or have much more strength in it. This when back and forth for, well, hell, it’s still happening!
Hold on it there. This WILL get better.