Have just been thinking back to childhood days and driving the Ferguson TE 20 which Dad bought new in 1948 and which we still own - or at least my son does!
I spent probably hundreds of hours driving this but one thing that really annoyed me was the very small independant brake pedals as found on the earlier TEs. These wer e stupidly small and going for one or the other you could easily miss them orif you ahd mud on your boots, if you did locate, then your foot could easily slip off.
Later - I don't know at what serial number they were changed to a more sensible size - I guess they might have been around serial number 60,000 but don't take this as definitive. Our tractor was 39615. It's the only one of my tractors' serial numbers that I remember because there it was starting you in the face every time you drove it!