It's not the best place to see them. There is another site which is much better and where you can get a lot closer. You certainly don't need binoculars.
But you do need a permit!
To clarify the position of Red Hell in England, there are three recent sites.
The Hampshire site has not had records since 2004 now. Even then, visitors are not encouraged into the main flowering area, which is fenced off with signs barring access. Permission is required by Hampshire County Council, the site managers.
The Gloucestershire site is managed specifically for the plants, and the enclosure is next to a bridleway, giving public access to some nice plants, but unfortunately at distance
The Chilterns site is on private land, and is protected as a nature reserve. Since the small number of flowering plants (usually about 6-7) were vandalised (trampled, picked and flowering spikes broken off) in 2010, they, too are in an enclosure which is not accessible. the enclosure is well off any footpaths and quite difficult to find in the wood if you do not have specific directions.
Rumours of a fourth site so far have not been proven true, with hinted at places having been checked in recent years with nothing found.
Given the above, I'd always recommend the Gloucs site to anyone desperate to see them in the UK.
Sean