Andy
I think that the betters are clear in their rules that the prices they use for their contracts are their own and need not reflect the market share price. I believe you are right that the betting companies increased their margin requirements at suspension. The main aim of that was to try and get holders to pay the betting companies and then hit financial troubles rather that the betting companies having to wait/not get their money. I owed a SB company some money and they started chasing me twice daily from the day the contract closed sending letters, statements and phone calls until I paid. They are bookmakers and they behave like bookmakers. They know they would have trouble getting their money if someone was in genuine trouble so they apply the pressure hard and fast. They wouldn't be my first choice to pay if I was in difficulty but, this needs professional debt counselling advice.