Yeah sure thing, just give me your credit card and personal details and I'll give that a crack for you. :):)
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RTFM :):)
https://www.gro.gov.uk/gro/content/certificates/most_custome..." Q4. If I don’t have the index reference number what will happen?
If you do not have the GRO index reference you may still apply online for any event which took place on or after 1st July 1837 to 6 months from the current date (for marriages this period is extended to 18 months) provided you have sufficient information to identify the entry.
A 3 year search for the index reference will be carried out.
You should supply the exact date of event if you have it.
IF YOU DON'T HAVE THE EXACT DATE, ENTER 01/01/YYYY AND WE WILL SEARCH THE SPECIFIED YEAR AND ONE YEAR EITHER SIDE.
If you do not provide an index reference number, your application will take up to 15 working days to process. There is a separate policy for events which have taken place in the last 50 years and full identifying information must be provided (see Q7 under “Important information on delivery times and policies.” "
If that doesn't work, phone them, or email them.
https://www.gro.gov.uk/gro/content/certificates/contact_us.a...Or pay an outfit such as ancestry an inflated fee to apply on your behalf.
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If I had been setting up that system, I would have just provided a simple tick box, tick if you don't know the full date, and a facility to include as much of the date that you might know, such as the year, but I suppose that would have made it too easy to use.