The Snettisham Torc is probably one of the most famous British Celtic artifacts, with good reason. It’s gorgeous, and exceedingly well made. A fair number of torcs have been discovered as parts of hoards in Britain, many of them in the Iceni territory around Norfolk. The so-called Sedgeford Torc was discovered in 1965. Recently archaeologists in Sedgeford, Norfolk, near the site of the original find the torc was part of, found what appears to be the missing terminus link of the torc. You’ll no doubt notice that despite the damage, the quality and style of the Sedgeford torc is strikingly similar to that of the Snettisham torcs, suggesting that they might have been made by the same artisan or group of artisans.
I’m less than convinced by the Boadicea/Boudicca link, though I grant you the location and quality of the torc would make it appropriate. And the description of Boudicca from Tacitus Annals 14., chapters 29-38 does refer explicitly to a torc, and they are associated in texts and iconography with high social status. Boudicca was an Iceni queen, who responded to Roman abuse with a rebellion in 60 A.D. that managed to burn Colchester and much of London before it was stopped. She probably died from a suicide dose of poison. Tacitus writes that Boudicca wore a torc, which of course encourages speculation that this torc was “hers.”