In reply to Owen Diba:
Nice one! I'm not a numismatist (I opted for the specialist course on Latin inscriptions rather than Roman coinage when I was an undergrad) so I'm not going to be able to identify it I'm afraid, but Lankyman may well be right that it falls into that messy period of Roman history known as the 'third century crisis' or perhaps the 4th century. If you have nothing to do over the bank holiday you can always see if you can find something like it on here:
http://numismatics.org/ocre/
(using the search term 'radiate crown' may help but not much - that motif became very popular)
You can also report the find via the Portable Antiquities Scheme which is designed partly to encourage the formal recording of casual 'small finds' which don't count as 'treasure'. And yours most certainly isn't 'treasure'!
https://finds.org.uk/
Click on the 'get involved' button.
I wouldn't worry too much about photos of the find spot. Unless it's in an archaeological context (ie you've dug it up) the immediate spot of the find, so on the surface as you found it probably isn't going to be particularly relevant. The location - grid ref etc - will be.
You may also find groups on social media who can help you identify it.
Have fun. I'd spend more time searching myself but I'm off for an overnighter into the Beacons!