not good not good.
mini roundabouts always cause grief, and in this case it looks like they've put it in to replace a T junction onto a main road?
if the choosen exit had say one car slowly moving into it, then you can theoretically move onto the roundabout, and aslong as you keep moving and don't become stationary (except thru accident) you should be OK.
I remember on my driving test (over two years now
) that I moved into a yellow hatched area infront of some lights, and there was no where for me to go, so instead of stopping or reversing back to safety, I just crawled across, fully in 1st gear at idle, and passed no prob's. I asked examiner afterwards about it, wondered if I'd got a minor (which I didn't) for it, and he said it is perferctly OK to creep across such hatched area's and mini roundabouts and traffic calming measures.
BTW not declarinng your mod's, even so much as a gearknob is a no no, most mod's won't cost you anything (like knobs, and painted bits, different carpets,
stickers, stupid flashy led things etc), but not declaring them ain't gonnna put you on very firm ground.
if you are fully comp you haven't got much other than your premium to worry about, if your 3rd party and its 100% your fault you better start looking for a moped