The British government has never formally apologised for slavery despite repeated calls from a number of Commonwealth leaders.
The second series of the hit show reached its climax on Friday after attracting 15 million viewers.
The home secretary has faced opposition from within the government over plans to impose new rules on migrant workers already in the UK.
With high pressure developing across the UK, the start of November is looking very settled with no significant rain in the forecast.
The force said it had received information and stressed its inquiries were at "an early stage".
Simon Richardson is convicted of murdering head teacher Michael Mullins and will be sentenced on Monday.