I might have 3, a 1961 with track ends, 62 with 5/8 stays and wrapover, probably prugnat long lugs ("italian style"), and a 1966 with Nervex pro.
Not convinced your red one is though, difficult to tell from pictures.
i was only guessing by what someone else said and the frame number looked about right and it seems to have been in surrey all its life .the previous owner had it in his loft for 25 years.how is the frame number laid out on your 61.i had to get my son to put the photos on and he has gone back to uni .i will try to put a picture of the frame no on.