If you can deduce a date by using reference to Discogs, then you are doing better than me. There are several tens (hundreds?) of records issued in New Zealand on Discogs with Phonogram Ltd. showing somewhere and issued in 1972. I'd be surprised if they managed to issue all those records in the last month of the year. And we're also assuming that the information on Discogs is reliable...
As far as sales go, there are 71 for sale currently shared across 12 different European countries. 6 in Germany, 6 in Italy, 6 in Greece, 3 in France. Europe seems like a good compromise.
Can you please check the spelling of the group? (It was listed as Uriah Heap). Best guess for the date is that it was released at the same time as the very similar Australian issue with the same catalogue number in September 1972.