A nice memento, gensec. The good thing about such documents is that they are an accurate record of a person's period of service. Why two certificates? Are they identical? If they are, your father may have served in two different units and his information was therefore duplicated.
One or two points arising out of Arkrite's post.
It seems that whilst the Home Guard was largely immune from bureaucracy in its first desperate days, red tape quite soon caught up with it. There is a summary of the situation on a website page
here, including much contemporary comment. It must have been a nightmare for those trying to keep a clear view of the priorities.
I'm sure that the record of all members of a HG unit was carefully maintained - no doubt in triplicate! - together with much other information. The question is, how many of these records were held centrally/nationally and how many by individual zones, areas and units. Some of the centrally held records, such as the list of officers, have tended to survive and in the case of the 1941 Officers' List have even been published. But the vast majority of the locally held material, including complete membership lists, was junked after standdown, no doubt with a sense of relief. What survived was saved by accident or by individuals out of a sense of history and perhaps sentiment. But there is precious little of it.
I believe that official recognition was due to every Home Guard member with a minimum length of service. It was in the form of a certificate of the type which gensec has posted. If a HG man (or woman) did not receive one this would have been either due to a relatively short period of service or an administrative oversight, of which I'm sure there were many examples. Individuals could also receive other commendations for particular services. And units themselves would obviously have received thanks from their superiors. But the whole thing did fizzle out and there was some bitterness at the time about, as Arkrite rightly describes it, "the cursory dismissal by the government".
Individual Home Guards were eligible for the Defence Medal, provided that their service was not less than three years.
Chris