Got it!!!!!
The trial was held on Wednesday March 27th 1844 at the Lent Assizes held in Norwich. (March 25th was the opening of the session). The case is reported in the Saturday March 30th edition of the Norfolk Chronicle exactly as follows:
SHEEP STEALING. -Robert Drake and Thomas Travers [not in the calendar] were indicted for having stolen, on the 10th of March, a sheep, the property of Mr. Matthews, of Wymondham. -Mr Evans prosecuted, and Mr W.Cooper defended the prisoner Drake. -The sheep was taken away, killed, and the skin and part of the carcase were found in a field belonging to Mr Atkins. Some mutton fat and bones were found in Drake's house; also some mutton in a chest, wrapped in a handkerchief.The bones were found to correspond with the part of the carcase found in the field; and the shoes of the prisoners fitted impressions which were made in and from the field. -Guilty. To be transported ten years.
Note the different spelling of Travis.
The only Robert Drake from Wymondham lived in White Horse Street, his father was a publican -and if it is the same one, he was 14 at the time of the offense (you could check the convict records). White Horse Street is about half a mile yards from the railway station -but what is just as fascinating for me is that it is at the end of the road where I live.
The Atkins farm appears to have been at Coston, which is about 5 miles away from Wymondham, but again is about half a mile away from the railway line. Haven't tracked down Mr Matthews, but it is still common practice to graze your sheep on someone else's land. March is of course lambing time.
There is a Thomas Travers of the right age in the 1841 census, recorded as staying in what appear to be slum dwellings called "Peerless Place" in the seediest part of Shoreditch London. Interestingly he has no place of birth recorded and his occupation is given as (I think) MS whatever that means. As some of the the women are given as FS, the M presumably stands for male. Anyone any idea what the S stands for?

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Anyway, hope that all helps. I've got a scan of the court report if you'd like it.
Best wishes,
Pete