1. What do you mean when you state disclaim for consideration? Normally, there is no obligation for anyone to pay anything if someone disclaims. It is not disclaiming if someone wants to be paid. Is there going to be a Deed of Variation executed? Who intends paying these people and out of what? Has the necessary tax been paid on any consideration (money) being given to these people who are disclaiming? Consideration normally means something of value, such as money.
2. I will Opt Out of this Question and leave it to someone who has a better knowledge of the law relating to disclaimers.