Question on Inheritance Tax

This month's Which? had an article on Inheritance Tax (IHT) and it said that money in Defined Contribution accounts did not count towards the nil-band rate for IHT.  Their advice is to draw down income from other savings first, leaving the DC money alone, if you can afford it. When you die the money in that DC pension pot will pass to your heirs without any consideration of all or part of it being subject to the 40% IHT.

My question is does this apply to a DC plan from a another company? My wife and I both contributed for many years to our company's DC plan while working in the USA. (for us it was a 401k plan).