I'd moved to a different area of the field (due to needing a wee behind a hedge), but as I started to walk back across the Bean stubble I got an 11 signal. I was expecting another little bullet, but much to my suprise something slightly shiny appeared. The coin on the left of the photos.
Just as I'd found the coin, the tennant farmer arrived at the field, so I wandered over to show him the find. We chatted for several minutes and I went back and checked over the hole. Well, just 8 feet away a 16 signal sounded off, it was another little Roman coin.

I gridded the area where the coins were found, but I couldn't detect any more of them. Some time afterwards I wandered in another direction and the little Roman Fibula came out of the ground!
Both coins were no more than 3 or 4 inches deep, the Fibula only an inch deep.
Any help with ID's is appreciated.