We are having a go at potatoes for the first time this year

We have 1st earlies and 2nd earlies, then my Mum bought me 4 of the potato bag planters as a birthday present

We ended up planting them all out at about the same time (next year we will do a bit more staggering!) and had our first harvest yesterday from a couple of the 1st early plants - 700g from 2 plants and they were very scrumptious

Anyway I'm scared stiff of Blight after horror stories about it from a colleague at work. Should I be worried this early? I've just cut back 3 plants that had what I thought were dodgy looking leaves - is there anything else I should/need to do?
Thanks for reading the ramblings of a Newbie

Tish