I can attest to those results. I also find that mobile connectivity is rather poor if you're out of the main towns and cities.
It found that cable broadband offers the real-world download speeds that are closest to the advertised speeds, at 91.4 percent, while fibre users are likely to get speeds that are 84.4 percent of ISPs' headline speeds. xDSL subscribers however fare the worst, getting speeds around 63.3 percent of their provider's maximum.
"In the case of xDSL we see a much wider spread [of average speeds between countries], with the UK and France only achieving just over 40 percent of advertised — far below the average of 60 percent. Other large, developed countries such as Germany do not suffer in the same way. Europe's Broadband Still In The Slow Lane [zdnet.com]