Bitcoin exchanges :

Bitstamp

A Slovenia-based exchange that allows cash deposits via SEPA and eCheck. It announced that it will also accept Visa and Mastercard credit and debit cards for UK customers in January 2016.

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CoinCorner

An Isle of Man-based exchange that is something between a full exchange and a peer-to-peer (p2p) marketplace. Users deposit funds in a CoinCorner account and then buy and sell bitcoin, litecoin and dogecoin with other users. The exchange started accepting 3D Secure-enabled Visa and MasterCard credit and debit cards on 23rd October. Otherwise, fiat currency deposits are made via SEPA bank transfer. No fees are charged on deposits, but there is a £10 fee for GBP withdrawals.

Coinbase

Popular exchange and wallet  provider Coinbase, now has a facility for UK users to purchase bitcoin using 3D secure-enabled credit and debit cards.

Bitcoin brokerages

Quickbitcoin

A London-based bitcoin brokerage enabling you to buy or sell bitcoins in any amount. Deposits can be made by UK Faster Payments or cash deposit at a bank. Also provides a bitcoin ATM at The Vape Lab, 232 Shoreditch High Street. For larger volumes (£2,000+), Quickbitcoin also runs an OTC marketplace. Accepts EUR and USD, as well as GBP, for larger amounts.

P2P marketplaces

These are peer-to-peer platforms that match individuals who wish to buy, sell or trade bitcoin and altcoins. They do not buy, sell or necessarily even hold cryptocurrencies themselves, unless as part of an escrow service.

Bittylicious

Provides a peer-to-peer platform for individuals to buy, sell or trade bitcoin and 11 altcoins, such as dogecoin, litecoin and feathercoin. Payments can be made via instant UK bank transfer, mobile payments such as PayM, PingIt and PYC, Visa/Mastercard, cash at UK corner stores or SEPA bank transfers.

BitBargain

Facilitates purchases of bitcoin and litecoin between individuals. A number of domestic banking transfer options are available, including: standard UK bank transfers, Barclays Pingit mobile payments, RBS Pay Your Contact, and Paym mobile payments (this is possible because transactions are between individuals and do not involve a bitcoin company). Fees are only charged on 'extras' like SMS messages.

LocalBitcoins

Matches bitcoin buyers and sellers to facilitate over-the-counter deals, offering an escrow service to protect the buyer. Users are charged small fees for wallet use and bitcoin transfers only.

Coinfloor Market

UK bitcoin exchange Coinfloor released a P2P marketplace in July 2015, which only features pre-approved bitcoin brokers. If you have an approved Coinfloor account, it can be fairly quick to get the coins you need, as the market utilises the UK Faster Payments system.

CryptoMate

Cyptomate allows users in the UK to buy bitcoin, litecoin, ripple, dogecoin and many other cryptocurrencies. The service works using UK bank transfers (Faster Payments) and coins are sent once the order has been processed. The service aims to send currencies within 1 hour of purchase. Non-verified users are limited to £250 in purchases per day and once verified this is increased to a £1,000 daily limit.