Yes, at the time the low floor buses were introduced, they were only promoted for disabled passengers, however parents with buggies soon found they could use that space without folding the buggy up and TfL had to design new signs for buggy users.

That's why I contested the reasons given by some of the parents on why they need that space when every parent used to fold the buggy up on buses in our area as not so long ago as 2000/01.