For me they tried to keep up with it as I went, so when I suddenly went to SMP only it looked like I paid negative tax (as in they paid me some back) for a month or two. It was towards the end of the financial year and it must have taken me down a band or two overall, so I actually got more than SMP those months. Then once I was back I got taxed way less for a few months, and it's back to normal now, I went back in August after a full year off.
@Carole oh that would actually be ideal if it worked that way and SMO was a bit higher / spread it over the year
Following as I am interested and in the same boat!