Hi and the gentlest of welcomes to Rootschat
I can't afford £25 per certificate!
And the good news is - they only cost £7 and you can order online
Are you looking for the reference so you can send for a copy of your grandfathers birth cert?
There is a free website
http://freebmd.rootsweb.com which can help you with that info
However - if you would give us your grandfathers birth details (date and location) plus his full names we will see if we can help
We may also be able to find his parents marriage so can you also include his mum and dad's christian names