Inheritance Tax threshold freeze

From when I heard that little dig last week that if Labour were so anti-rises in inheritance tax then why were they raising it themselves I knew this rise would have to go, and lo it came to pass today. But do bear in mind that it is not as clear cut as Alistair Darling pretends; the inheritance tax threshold may well be frozen at at £325,000 rather than rising to £350,000, but it will allow couples to pool their total IHT allowance to make £650,000. That looks like an IHT tax cut to me. So is the Labour party as opposed to cutting IHT as it likes to claim?