The companies responsible for inundating British homes with nuisance calls can be named.

A string of firms, including major household names, are making millions of unsolicited calls to landlines each year in the hope of gaining business. Some of the calls are silent, causing irritation, fear and confusion, particularly for the elderly and vulnerable. Until now the scale of the problem, and the companies behind it, have been unclear.

Top 10 numbers most blocked by trueCall users
Company. Extrapolated figure for UK calls
1. British Gas 4.1m
2. Curved Air 3.7m
3. I-smart 2.2m
4. Unknown telemarketing firm using number registered in Leeds 2 m
5. National Moneysavers 1.7m
6. Still active number previously attributed to defunct marketing firm 1st Call Connect 1.63m
7. Nationwide Energy Services 1.6m
8. DLG Surveys, known as 'Consumer lifestyles’ 1.1m
9. Loft Insulation 0.9m
10. Moorcroft debt recovery 0.3m

More info, follow the link here