Getting Crown is done by either paying somebody to send you Crown or by purchasing Bitcoin and then trading it for Crown on an exchange.
One company that will sell Crown in exchange for GBP using UK bank transfer is CryptoMate.
CryptoMate have a network of vendors that are notified when orders come through. They then pass on their bank details for you to make a bank transfer using faster payments. Once payment has been received into their account, they then release funds to your wallet.
Before purchasing from Cryptomate, you must be sure to have a wallet address to receive Crown to.
Alternatively, you can trade Crown for Bitcoin on an exchange such as Bittrex. To do this, you must first purchase some bitcoin. Just a few of the reliable Bitcoin exchanges in the UK are
A good place to track prices and see which Bitcoin sellers are offering the best prices is