An update of my list of early 20th century British newspapers online is well overdue. As such, there are a large number of new titles available (some only for a limited range of years), along with the usual additional ranges of years for existing titles. But it's clear that the imminent First World War centenary has really driven this expansion, or at least shaped it, because the range 1914 to 1918 appears over and over again.
By far the most new titles come from Welsh Newspapers Online (WNO):
Abergavenny Chronicle
Abergavenny Mail and Farmers' Gazette
Adsain (Corwen)
Amman Valley Chronicle
Baner Ac Amserau Cymru
Barmouth and County Advertiser
Barry Dock News
Barry Herald
Brecon & Radnor Express Carmarthen and Swansea Valley Gazette and Brynmawr District Advertiser
Brecon County Times, Neath Gazette and General Advertiser
Brython (Liverpool)
Cambrian Daily Leader (Swansea)
Cardigan Bay Visitor (Aberystwyth)
Carmarthen Journal and South Wales Weekly Advertiser
Carmarthen Weekly Reporter
Carnarvon and Denbigh Herald and North and South Wales Independent (Caernarfon)
Chester Observer
Chester Courant and Advertiser For North Wales
Clorianydd (Llangefni)
County Echo, Fishguard and North Pembrokeshire Advertiser (Fishguard)
County Observer and Monmouthshire Central Advertiser (Usk)
Darian (Aberdare)
Denbighshire Free Press (Denbigh)
Dinesydd Cymreig (Caenarfon)
Dravod (Trelwe)
Flintshire Observer (Holywell)
Genedl Gymreig (Caenarfon)
Glamorgan Gazette (Bridgend)
Gwalia (Caenarfon)
Gwyliedydd Newydd (Blaenau Ffestiniog)
Haverfordwest and Milford Haven Telegraph (Haverfordwest) (free)
Herald Cymraeg (Caenarfon)
Herald of Wales (Swansea)
Llan (Rhyl)
Llandudno Advertiser and List of Visitors
Llanelli Mercury and South Wales Advertiser
Llanelli Star
Merthyr Express (Merthyr Tydfil)
Monmouth Guardian (Rhymney)
Negesydd (Glayndon)
North Wales Chronicle and Advertiser For the Principality (Bangor)
North Wales Times (Denbigh)
Pembroke County Guardian and Cardigan Reporter (Solva)
Pontypridd Chronicle and Workman's News
Rhedegydd (Blaenau Ffestiniog)
Rhondda Leader (Tonypandy)
Rhondda Leader, Maesteg, Garw and Ogmore Telegraph (Tonypandy
Rhos Herald (Rhosllannerchrugog)
South Wales Weekly Post (Swansea)
Tenby Observer, Weekly List of Visitors, and Directory
Towyn-on-sea & Meirioneth County Times (Welshpool)
Tyst (Merthyr Tydfil)
Udgorn (Pwllheli)
Welsh Coast Pioneer (Chester)
Welsh Gazette and West Wales Advertiser (Aberystwyth)
Welshman (Carmarthen)
Wythnos A'r Eryr (Bala)
This is an extremely impressive expansion; in fact there are now so many Welsh newspapers I've had to break up the listing in order to make it more readable -- Scotland and Ireland, take note. This raises the question of whether I will continue to include Welsh-language newspapers in this listing: it would make my life easier if I didn't have to check them too, and not many researchers outside of Wales can read Welsh. But when combined with the superior user interface and the completely free access, this makes WNO the most impressive online newspaper archive in Britain. The only limitations are the scope: nothing later than 1919, and nothing that's not Welsh (though it now includes a few titles published outside Wales, in Chester and Liverpool, aimed at or including Welsh markets).
These are the new titles in the British Newspaper Archive (BNA):
Biggleswade Chronicle
Birmingham Daily Mail
Birmingham Daily Post
Birmingham Gazette
Burnley Gazette
Burnley News
Chelmsford Chronicle
Cheshire Observer
Daily Gazette for Middlesborough
Daily Herald (London)
Daily Record and Mail (Glasgow)
Evening Chronicle (Newcastle)
Evening Despatch (Birmingham)
Folkestone, Hythe, Sandgate & Cheriton Herald and Chronicle & Observer
Hamilton Advertiser
Lancashire Daily Post (Preston)
Leicester Chronicle
Liverpool Daily Post and Liverpool Mercury
Perthshire Advertiser
Sports Argus (Birmingham)
Sussex Agricultural Express
Western Mail (Cardiff)
There are some good things here. Birmingham was previously completely unrepresented, but now it has no fewer than five newspapers, including, unusually, a sports newspaper. However all of them are only available for 1914-1918. The most important newspapers here are probably the Labour Daily Herald and the Cardiff Western Mail, though again they are only for 1914-1918. A small number of titles have actually had issues removed from BNA, whether for copyright or quality control reasons I'm not sure.
The other major archives all have new titles too, though not many. Several Kentish newspapers have been added to ukpressonline for 1914-1918: Herne Bay Gazette, Kent Messenger, and the South Eastern Gazette. More interesting is that these newspapers for the period up to 1912 can be accessed for free, as long as you accessing them in Britain and use a special landing page. It looks like this has been the case for a while, though I missed it because it's not at all obvious from the usual ukpressonline site. Irish Newspaper Archives has added a couple of titles, the Dundalk Democrat and the Skibbereen Eagle. Unfortunately the Kildare Observer, which used to be a free sampler, now has to be paid for. This is probably to do with an upgraded user interface, which is much improved (but unfortunately doesn't seem to work in all browsers). And NewspaperArchive has added a suburban London paper, the North London Mercury And Crouch End Observer, as well as the London and Belfast editions of the US Army newspaper, Stars and Stripes (for the Second World War, obviously).
Finally, a nice standalone (and free!) archive of the Halifax Courier is now available for the First World War period -- thanks to Bruce Gaston for the tip.