Hi SCOMAN, if you're going to slow cook it, then its like a braising process so it'll be well cooked and should fall off the bone, yum yum!! I've cooked Roe shoulders a few times by just putting them in a casserole dish with onions, carrots and any other veg you fancy. Season well and add a half pint of stock, cover with tin foil and cook for 3 - 4 hours at about 160c. You could turn the temp down to 140 and leave it for 5 hours if you like. You'll find that it takes a while to get really tender because their isnt any fat running through it, so dont wory about length of time in the oven. Its great to chuck in the oven and head out for the afternoon.
Cheers
RR