I went myself to Tesco Express and Mini BigC, nobody is showing price per kg, as this is pre-packed from factory.
Strategy for Mini BigC has been since then to have lower pack size to show lower price point.
So on my side I do not match by weight, simply because with lower pack size fatcory cost is higher per kg.
My commitment is to have always cheaper price per pack, and it was not the case in every case.
Now we already lowered the price to have all our prices below tesco prices.
Thanks