Hi Fiona
You are right, i did a quick look up to see how the Banns worked and instead of reading the whole paragraph just picked up on the three months but its the wedding that has to take place within three months
The banns are read aloud in the church on three successive Sundays before the wedding and, if the couple live in different parishes, the banns must be read in both. You need to be resident in the parish for seven nights before the first Sunday of reading the banns right through to the last Sunday (a minimum of 22 nights) and the wedding must take place within three months of the banns being read.
Shelagh