SparkleRainbow, GP refuses to refer to GOSH and the four paediatricians we have seen all say there is no need 
DS is nearly seven and has had constant pain since (I think) 9 months, definitely 18 months when he became a bit mobile. He really needs a pain management plan. He also has a diagnosis of Co-ordination Development Disorder that I was only told about last week, although it was given in 2008. He has a speech delay/problem (no clear diagnosis as yet
. He also has soft, velvety, stretchy skin, pain and hypermobility in every joint, wears Piedros and inserts, uses a wrist splint to write/draw and is absolutely gorgeous and incredibly brave!! Oh, and he gets very clammy all the time, but weirdly, feels very cold when he eats.....
DD1 is hypermobile in every joint, but only pain in feet/ankles/knees/thighs and lower back. Wears Piedros and inserts, uses a wrist splint to write. Has some Marfonoid features, but I am laughed at when I mention it.
DD2 only has pain in ankles but all joints are hypermobile, wears inserts, just about to push for Piedros, would do well with a wrist splint, but not allowed a referral to OT as 'not severe enough'.
I feel they would benefit from being seen at GOSH, even if only once, just so they would have been seen by someone who really knows what they are looking at. They need some kind of plan. Not me chasing sporadic appointments till I could cry in frustration, but an actual plan where they are seen and treated by the appropriate people. Sorry, didn't mean to rant 
By the way, and they all sit exactly as you describe!!