The format of the show was changed so that you only had 1 episode a week instead of 2.
So, previous series 2 couples were nominated and had to do a challenge and the 2nd episode of the week was the challenge and one of them getting fired. This series, there was no challenge - they just got fired.
Also, the placing of the restuarants and who got what really wasn't random - the couple doing dishes from Ghana got their restuarant slap bang in the middle of the largest afro-american area of Bristol, the 'Winkers' (who eventually won) got a restuarant that was very suitable for them as well.
But the main problem was that the 2 who won actually couldn't cook! They won on their personality but not on their actual restuarant management skills.