Draughts round windows and doors and under window boards
Draughts under first floor cooling lounge ceiling and bedroom floor
Lac of insulation in dormer walls and sloping ceilings
Draughts through loft trap and eaves cupboard doors,
Draughts through electrical fittings
Draughts in airing cupboard
If wooden ground floor draughts under skirtings (and upstairs too)
Pic of sealing round insulation behind dwarf walls (thanks Jeff from GBF ) neatly fitted sheet insulation sealed round with acrylic sealant 