Definition of excempt excepted estate

(This is an IHT administration question - sorry if it is in the wrong place) My husband recently died and I am his personal representative. I am also inheriting all his assets, so from an IHT perspective there will be no IHT to pay. The question is whether I need to do the IHT forms, or whether it is an exempt estate. His assets are over £500K and under £3 million and everything is left to me. He also has a stakeholder pension, which I understand is outside the estate so doesn't count towards the £3 mln limit So far, no IHT forms required. He did however contribute to the stakeholder pension while he was ill knowing he had a very limited lifespan (because I didn't cancel the direct debit in time). This was less than the permitted limits given he still had employment income in year and in total was

Hi,
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Inheritance Tax: general enquiries
Thank you.