Looking after grandchildren - do you receive childcare credits?

Didn't know anything about them.
To be fair I am not worried about NI contributions as HM GOV have kindly told me that I have made the maximum contribution needed to get my full entitlement to the pittance of a State Pension once I am 66!! I have always either been working or claiming Child Benefit for my own children under 12 (class 3 credits)
Surely Grandparents would only be entitled to these credits if they were full time carers to the grandchildren in question. I only have mine on an ad hoc basis as his father works shifts and the rest of the family help out too.
I think some way of grandparents being able to benefit from the childcare voucher scheme or a tax break would be more welcome.

I certainly didn't know that I could be eligible

Lara - do you mean child care credits or NI credits ( which the link takes us to) I'm