Thanks guys for your replies.
I have searched the PRs for Abingdon and other areas in Berkshire/Oxfordshire without success, in an attempt to find a baptism record for John. I think that John mayn have married Sarah Moss at South Hinksey (as John Pick of Abingdon) and had one daughter Ann Pike. He was living in a house in Turnagain Lane in Abingdon when he was arrested. I have a copy of the Assizes records for his trial in 1797, but no mention of a wife or child. Here in Australia, none of John's records mention anything about his English past except that he was a native of Berkshire. John himself, apparently, would not talk about his life in England, so information is scarce and often misleading. That is why I am getting desperate in seeking a newspaper report on his trial. Unfortunately, living in Australia, with most of John's descendants, it is difficult to search unless indexes etc are online.
A lot of people here in Australia have been searching for John's parents for some time now, so I am trying to "think outside the square" a bit. If you have any other suggestions on ways to find out who John's parents were, I would greatly appreciate then.
Ian Pike