Mango excellent in my experience. Very friendly and helpful and bent over backwards to help me with my fussy vegetarian ds (no idea where he gets that from
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Breacon trip - accomodation really nice. Shared self catering cottages (shared with one other family) but our own room, plenty of showers and each cottage had big kitchen space for own catering as well as several meals cooked by co-ordinator for us. Lots of space to run around, lovely walk down to village. Activities on our holiday were well organised and planned, our co-ordinator clearly knew area well and reasonably priced (though bear in mind you'll be paying extra for any trips/activities you do go on and if kids getting on well they'll want to do everything the others are too). We went horseriding, to an activity centre for wall climbing, tunnelling etc, afternoon at lake feeding ducks or hiring canoe/row boat (very interesting rowing by some!), extremly muddy walk to waterfall (ds got stuck in teh mud and I had to rescue his wellies - best day of holiday he said). Very friendly and relaxed and definitely recommend that trip.
Mango Xmas party - Think they have changed location now but when we went we had lovely accomodation/hotel, excellent food (again bent over backwards to ensure ds had something he would eat). Magician had ds transfixed, santa train trip was amazing - one of the best santa's ever been too and ds got a really nice gift, zoo outing would have been good if it wasn't so cold we were absolutely frozen and left early to go back for a swim! Would go again but it seems to clash with so many other xmas things here that we didn't make it this year and last year I was recovering from injury so couldn't consider going away.
So have booked woolacombe this year - On booking got a very lovely email from leslie (who we met before on both our previous trips) welcoming us back. Really pleased to see frazzled's recommendation above for it and am extra excited and looking forward to now!
Not sure how old your dc are going round but the do a tots holiday which is specially for littler ones. May be something to consider for OP as his dc are young still (which I didn't realise when I originally posted above).
SWK do have some private rooms, but these usually go very fast (think there were 3 on the xmas trip - I tried to book it as soon as it came up on website and they were all gone). You may find with 4dc and yourself that you'd get a whole chalet/cottage/tent to yourself though depending on the trip. Good coms when I've contacted them in past so suggest you ask for more details if you have query re accomodation situation.