Good map as you would expect from the OS, but be warned that fully unfolded it is a metre square! You couldn't be doing with this outside on a windy day - or even on a calm day as it is quite difficult to manage. This is probably a small price to pay for the good information on the map and you can always re-fold it the wrong way.
I bought this map prior to going on holiday to Wales as I always have problems trying to find decent places to walk my dog, and also ideal beaches for him to run on. I found thus map ideal for both these purposes, and my dog was very happy with the outcome. I was able to find beautiful places that I would otherwise have missed.