I am not sure on fibre wise but I do know that my pigs love it. It is the only hay they eat and I have never had any problems with my guinea pigs in the poop department! I would recommend it and it is great value as well.
I've just started buying the same one for our piggies, as it looks & smells nice, green & fresh! they seem to like it & it's great value from The Range. Our piggies also really love Dandelion & marigold hay from B&M stores!
I've used that hay before and my piggies love it. Yes @sport_billy the range has a garden centre but they also sell lots of other various things including pet supplies, DIY, home furnishings, toys cards, crafts and gifts etc