I genuinely struggle to understand how women (and it is almost always women) can get so wrapped in 'how could you possibly fit that size when I weigh so much less & I'm this size' etc etc etc.
OP clearly carries significant amounts of muscle in her legs. She's fit, muscular, a healthy but fairly low percentage body fat.
Her BMI weighs slightly into overweight at her current composition, but as her GP has said, as she is at the moment 'keep doing what you're doing'.
It is also completely true that she could be exactly the same weight & at significant risk of several lifestyle diseases is she was, for example 40% body fat at the same weight, rather than around 25% (which I would guesstimate she currently is based on the photos). That would represent nearly 10kg of muscle mass loss & carrying it as fat instead - same weight, VERY different health prognosis.
If you don't have a history of eating disorders OP, get yourself down to Argos with twenty quid in your pocket and buy one of these https://www.argos.co.uk/product/8478823
You can measure where you are now, and keep a rough eye on how you track over time, measuring once a week.
If you're a stable weight, +/-2kg from 'norm' wouldn't be a big deal at all. Given the limitations of just measuring body fat through your feet, +/-2or3% would be completely normal. Anything outside this would suggest it's time to get a bit more proactive about tweaking intake down & ramping muscle-building activity back up.
I don't understand the comments about weighing being hard work at all. It's fast, accurate, and unless anyone has a history of poor mental health or ED, is an extremely easy way to get answers rather than guessing.
If you feel short-changed in some way that it's that cheap & easy to get accurate answers on a long-term basis based on you & no-one else, you could always pay to have a DEXA scan now, so you know if your visceral fat is in the healthy range (which combined with cholesterol tests & checking BP, might be a more useful sense check ca family history?). It would also give an idea how much above or below the £20 scales register your current body fat percentage.
BMI is a useful starting point for general health/weight management. Generally too many people are happy to put an 'overweight' BMI down to some kind of exceptional genetics, when the truth is they could really do with losing 5kg. In your case, you are very muscular & absolutely healthy at your current weight. High BMI in muscular athletes doesn't represent any kind of health risk at all.
If someone has a high BMI AND body fat over 30%, that's the time to start doing something about it.
Stop looking for complicated solutions when a very easy, very affordable one is available on every high street in the country 🤷🏼♀️