sara is right,
When you reach 60 (Male or Female) you can apply for Pension Credit,the amount that the goverment says you must have to live on (I think it's something like £130 in total,inc your pension that is).
If you are Male you will recive Incapacity benefit+Pension Credit till you are 65.
If you are Female,the Incapacity Benefit will be replaced by the State pension+Pension Credit (as above)
This should not affect your Carers Allowance(but check with the DWP)
as sara also says you should think of applying for Income Support,to tide you over till you are 60(in either case).
I wouldn't think of collecting the Insurance Policiy till you reire,as that would probably lower your present benefits.How it will affect the Pension Credit only you can say,as it may take you over the limit that the Government says you need to live on.
I would hang onto it till you are 60 or 65 depending on your sex,unless you need it desperately.
As far as the Insurance Policy goes,only the Insurer can decide whether you are " medically retired" in respect of the policy.
If you like,try this website EntitledTo.com,which enables you (anonymously) to see what you are entitled to:~
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