http://www.bbc.co.uk/news/uk-england-wiltshire-36062538
I'll leave it for others to find better references to this news story :)
http://www.theguardian.com/uk-news/2016/apr/17/amazing-find-roman-villa which contains a little reconstruction sketch, and this snippet:
QuoteIntriguingly, the house was not destroyed after the collapse of the Roman empire, said Roberts. Archaeologists have discovered timber structures erected in the fifth century. Roberts said the remains from this period, between the end of Roman occupation and the completion of Saxon domination of England, could open a window into one of the least understood periods in British history. It could also reveal how people responded to the collapse of the Roman empire, the superpower of the age.
very interesting Duncan. As the piece says, potentially a missing 'continuity' element from Roman to Saxon Britain
And one which is consistent with an 'Arthurian' period in which Romano-British or 'sub-Roman' culture continued to survive if not exactly thrive.