I’m not aware of Bamfords selling Doctor Who items before, but their sale next week has twenty-one lots - rivalling any Bonhams auction in recent years.
As usual I have separated the items by Doctor era, and you can see the rest of the items here:
Here are just the lots relating to the Sixth Doctor era
Doctor Who - Terror of the Vervoids - a Grenville costume, worn by Tony Scoggo, 23rd season, first broadcast 1st - 22nd November 1986, comprising shiny green jacket and trousers
Sold for £650