OK so after reading all the above posts and consulting "food for free" here is what I have come up with.
Whilst out with the wife and kids today we collected these:
They are much more fuller than the ones I pictured in post number 1, and all were free from their prickly cases, lying there crying out to be collected
Here are a few for size comparison with a medium Victorinox:
At this point whack the old oven on, I did these on gas mark 5 for 15 mins, but pre-heated first.
Cut a cross in each sweet chestnut ensuring that when it rests the cross will face upwards.
Place your desired amount on a baking tray (I covered mine in tin foil first, to aid with the cleaning later).
not forgetting the crosses need to be facing upwards
and shove them in your pre-heated oven.
After 15 minutes the outer shells should have opened up like this:
Remove the outer shell with your fingers and the thin layer of skin beneath to reveal the sweet chestnut below and munch away
On some of these I had cut the cross deep enough to easily remove the thin layer of skin beneath the outer shell, on others I hadn't cut quite deep enough and it was a little tricky, I suppose it is all trial and error. I intend to get a good few more pocket fulls for bonfire night and have a bash at roasting some on an open fire. for this one will have to be un-cut with a cross, when this explodes all over the shop, the rest should be ready.
Hope all this makes sense to any-one who like me, wondered how to prepare and roast these bad boys.
ATB....Stu
PS Thanks to all of you who left tips on this thread, really made things alot easier for me....Stu