[Kymmy]

The strongest signal on that list is Winter Hill.. It says High Gain so that normally means you need a semi-decent antenna on the outside of the house to get the signals..

As for putting it in the loft there's so many factors that can effect that like building materials the roof is made from, whether you are side onto the transmitter (i.e you;re going through other houses) or front/back facing (you're only going through tiles), what sort of antenna you get and whether you amplify it..

In this case I suspect for the loft you'd need a very high gain amplified antenna but even then it might not work. Probably best to get an external one up