"Where is Wigan's cheapest petrol" ??????
'Wigan' doesn't have any petrol. What you mean is, "Where is the cheapest petrol in Wigan"?
And is that 'Wigan', or Wigan council area? If it's 'Wigan', it's got to be Tesco. And I think there's only two petrol stations in Wigan!
The cheapest diesel in the 'Wigan council controlled area', is Leigh Asda or Sainsbury's.
The dearest I've seen anywhere else, apart from motorway services, is Sainsbury's in Westhoughton at £1.339 per litre!
In Mora, diesel is 92p a litre, petrol is £1.12 a litre.
I think ours will skyrocket when we leave the EU!