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There are four different versions of this coin. The one you saw for £400 - which was probably an asking price, not an actual sale - had to be one of the two better ones.

All four are bi-metallic, one thing in the center and another composing the ring.

The least-valuable is the copper-nickel center inside a brass ring. I saw an authorized mintage figure of 100,000, but according to the Royal Mint, less than 9,000 were sold. That's a low figure, but it says to me that the coin was not especially popular. Low demand, even in the aftermarket, usually means low value. This can always change. 30 years from now, folks may have realized that this was a coin they should have bought, and they may become valuable. I've seen no recent sales of one. My best guess is one would sell for no more than £10-15.

Next is the silver coin, and there are two versions. Both have a silver center inside a gold-plated silver ring. One is a Piedfort variety, which is a special version that is roughly twice the thickness and weight of the 'normal' coin. Sales of these two coins were 7,095 and 3,990 pieces respectively.

Last is a yellow gold center inside a red gold ring. One of these is currently offered on a website specializing in gold coins for 'investment' at £672, which is roughly a 25% premium above the value of the gold. That's a pretty sizable premium, but reasonable for a coin with a low mintage. Now, the funny thing about this one is that the website says 1,500 were made but RM says only 1,000 were authorized and it was completely sold out.

I'm guessing that what you saw for £400 may have been the Piedfort silver. But you never know with the internet. You have to pay close attention to the date something was created. There are pages on the web that go back into the 1990s, and any of those that contain pricing information are good for historical research only. £400 would have been a fair price for the gold coin five years ago. Today it would be a steal.

You probably saw the silver version

£2

Valuable 2 Pound Coins

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No, but I'll take them off your hands for fair price .... say £1 each? Joking aside, don't loose sign of the fact that there are people in this country to whom £2 makes a lot of difference. I hope you never have to discover that the hard way but some of us have been there. So, if anyone reading this has a £2 coin they can spare, perhaps they would consider giving it to one of the many good charities that will be trying to make life more bearable for people who find themselves in difficult circumstances this christmas.

i have a 18 07 slavery 2 pound coin says its not me its my brother is it worth anything

yes it worth about £400