Opponents of the £2.9 billion deal fear 16 million members may be on the hook for substantial costs that may be lurking in Virgin Money's Clydesdale Bank unit.

The huge injection is far higher than the £650 million previously reported, and will raise concerns that Nationwide may have bought a much lower-quality business than it thought.

Millions of Virgin Money customers will officially move to Nationwide in April. Here’s what stays the same and what changes.