The parliamentary arithmetic on the fox-hunting ban in England and Wales is not entirely clear, but one thing that does seem certain is that if the SNP stick to their original plan to abstain en masse, repeal is inevitable. If, on the other hand, they break their self-denying ordinance on genuinely non-Scottish issues, and if the bulk of them vote against repeal, things will get very tight. In theory, there are already enough declared Tory dissenters to tip the balance, but unfortunately Northern Ireland MPs are likely to break heavily for repeal, and there are also pro-hunting MPs on the Labour and Lib Dem benches (most famously Kate Hoey).
I'm relieved that the SNP are at least reconsidering their position, and to be honest I can't quite understand how they ended up where they are. Yes, fox-hunting is a clear-cut example of an English and Welsh only issue with no direct knock-on effects for Scotland at all, but it's also a classic issue of conscience that is customarily decided on a free vote. So why on earth should the SNP be the only party to impose a three-line whip? Individual MPs are perfectly capable of weighing up whether the principle of not voting on non-Scottish matters is more important than the opportunity to prevent widescale animal cruelty.
Of course Tory MPs will hiss and stamp their feet about the SNP "breaking their word", but nobody who actually matters will give a monkey's - SNP voters are far more likely to feel let down if the party needlessly sits on its hands as the values of a civilised society are rolled back. In any case, making the idiocy of the British constitution a pain-free experience for Tory MPs is no part of the SNP's mission in life.
As I understand it, the current English Votes for English Laws proposals would not affect something like the fox-hunting vote, because English MPs would only be given a veto over changes to the status quo. The theory is that to go any further would compromise the integrity of the UK Parliament. So if there's a clamour for something to be done after the "outrage" of the SNP voting on fox-hunting, that can only lead to the Union's integrity being undermined. I'd say we should all be intensely relaxed about that prospect.