Hi and welcome to the Forum.
Not an easy question to answer if you've not experienced it; there is a UK Gov website that should help you with some of the questions; this link will take you there.
I just filled it in as if I was you; it tells me that you would get nothing. I then filled it in as if I was you, but in receipt of State Pension, it then told me I could claim the allowances you are asking about. So it seems that receipt of the State Retirement pension is the trigger to also claiming benefits.
With regards to State Pension; I can tell you that how much depends entirely on how much you've paid in; there is an on-line guide that will forecast how much and when you are entitled to it; this link will take you there.
There is a system similar to the NHS in Gibraltar, but prescriptions have to be paid for.
For the cost of living, the Numbeo website offers lots of information; this link will take you there; I've just created a cost comparison between Sheffield and Gibraltar; this link will take you straight there. The costs are usually 6 months behind reality, but are good enough to give you a feel for it.
Hope this helps.
Cynic
Expat Team
