From the Institute of Chartered Accountants in England and Wales (ICAEW) – Tax News (my highlights) :
The number of self assessment (SA) tax returns filed by the 31 January 2018 deadline for 2017 returns has once again reached a new high. 10.7 million taxpayers submitted their return on time and 9.9 million of these were filed online. For those interested in statistics, this means that more than 92.5% of total returns were completed online. And of course it does also mean that over half a million tax returns remain unfiled.