Stu I have just looked at my Landranger map number 156 and Melton is right on the bottom edge with only a bit of the forest showing, the next map down is 169
I have been working it out on a 1:25,000 on Memeory Map, as I have the Whole country on it, I tend to use that days now, have Suffolk'ish in 1:50,00 that I keep in the Disco,
I know the whole area is covered by Sheet 212 on the Explorer Range in 1:25,000,
https://www.ordnancesurvey.co.uk/shop/explorer-map-woodbridge-saxmundham.html