There's still quite a lot of mechanical signalling in (especially east) Kent yep, as it's been pointed out a lot of it is due to go in the next 10 years, but some will remain for a long time yet.
Resignalling over the next couple of years:
Robin Hood line, part of Trent PSB and Kirby summit to Derby EMCC - This weekend
Leicester PSB - Abolished this Christmas, to Derby EMCC ditto Croft.
Slough IECC - Abolished this Christmas, to Didcot TVSC
Water Orton resignalling, next 6 months
Basingstoke - Exeter resignalling, 2012
West Burton resignalling, 2012
Crewe - Shrewsbury resignalling, 2012
Swindon B IECC abolished, to Didcot TVSC, 2012
Ely - Norwich resignalling, 2012
Harrogate area resignalling, 2012
Birmingham Snow Hill - Kidderminster, 2012
Dorchester - Wareham resignalling, 2013