If Ofcom's provisional ruling that UKIP only has major party status in England and Wales is upheld, this will be the position going into the general election campaign...
Conservatives : Major party status in England, Scotland and Wales but NOT in Northern Ireland.
Labour : Major party status in England, Scotland and Wales but NOT in Northern Ireland. (They don't even stand candidates in Northern Ireland on a minor party basis.)
Liberal Democrats : Major party status in England, Scotland and Wales but NOT in Northern Ireland. (They don't even stand candidates in Northern Ireland on a minor party basis.)
SNP/Plaid Cymru : Major party status in Scotland and Wales but NOT in England and Northern Ireland.
UKIP : Major party status in England and Wales but NOT in Scotland and Northern Ireland.
As you can see, there is no such thing as a UK-wide party, so if that is the criterion for inclusion in UK-wide debates, there will quite literally be no-one there. But the real problem here is that there are two parties or alliances that have major party status in two out of four constituent nations of the UK - and, as things stand, the broadcasters are proposing to invite one to the debates and exclude the other.
If this stands, it'll be hard not to conclude that the broadcasters see the so-called "UK debates" as in reality being Greater England debates, meaning that it's deemed perfectly natural for Scottish viewers to be bored to tears by a party that has major party status in England but not Scotland, but it's utterly unthinkable for English viewers to be expected to listen to a party that has major party status in Scotland but not England.
This quite simply isn't tenable. It also means that if the SNP seek legal redress, there'll be a blatant double-standard for them to point out that wasn't there last time around.
* * *
UPDATE : There's a downright inaccuracy in the BBC website's report, which claims - "The regulator is seeking views on whether others should be included in its lists and and says it thinks UKIP will qualify across Great Britain." That is simply not true. The Ofcom consultation page clearly states that UKIP may qualify in England and Wales. There is no suggestion whatever that they may qualify "across Great Britain". It really does appear that some journalists literally cannot distinguish between England and Britain.