Quarter

Now that Australia has (temporarily at least) followed countries such as the United States and introduced a 25c coin, I've been thinking whether the UK should have it's own Quarter. Obviously 25p for us LOL.

I mean the smaller denomination coins are rapidly becoming irrelevant thanks to inflation. What is the point of the (in relative terms) oversized 1p and 2p coins? Wouldn't a 25p coin be a far more useful thing to carry? I know we have a 20p coin but couldn't the Royal Mint be radical and do away with that as well, giving us instead 5p, 10p, 25p, 50p, £1 and £2 coins? Makes sense to me.