Hi Geoffrey Peter prunty,
We would need to look at your NI record and have additional information, i.e. when retired on ill-health did you claim any benefit? which could have given NI credits.
You state that his wife NI record was covered while she was at home - this will have been HRP/CHB credits as she was the named receipient of child benefit.
If there were years when his wife was working and still receiving HRP/CHB credits it may be possible to have these transferred to cover gaps in you record.
It would be best if you spoke to an NI agent so we could look at your record while discussing with you.
National Insurance: general enquiries