You're thinking of contacting Wolves Council to sort out a botch job they did in the first place over the Christmas period. Don't bother. Just nip up and get it sorted yourself, that way you know you will have the insulation rolled out between the joists properly and tucked underneath any wiring (as long as it has enough slack to be taken over the top), wrapped round the water tank if it's up there and not underneath it, and you can add an extra layer round the corners and perimeters if you want to. And of course, don't throw anything up in the loft that is heavy without having some boards down over the joists to spread the load.
I spent an hour last night finishing off insulating part of the roof that was left over from last winter and the difference downstairs was very obvious, partly down to the area bing on the exposed side of the house.
As for your other half's daughter and partner, if the flat is council or housing association they should be playing merry hell about what they have been given.
In case anyone else is wondering about their loft insulation B&Q are selling Knauf mineral wool for £3 for a 3 roll pack right now, which is decent value. Although it is only cheap stuff it has a R rating of 4.5 and will be very good as an additional layer on top of what you already have. It's worth just going and getting a few packs and rolling it out round the sides of the loft for that money. If it's a second layer I would lay it across the stuff underneath to trap the escape route warm air might have through the sides of old insulation and the joists.