Binance P2P: Binance is a highly regarded exchange with a robust P2P platform. It supports numerous fiat currencies, including GBP. The platform offers low fees, high security with KYC verification, and a user-friendly interface. Binance acts as an intermediary to ensure that both parties fulfill their obligations, holding the crypto in escrow until the transaction is confirmed​ (CoinWire)​​ (CoinGape)​.

OKX P2P: OKX provides a P2P trading platform with zero service fees for trades. It supports a wide range of fiat currencies, including GBP. The platform is known for its extensive security measures, such as holding the cryptocurrency in escrow until the seller confirms receipt of payment. OKX also offers a fast and straightforward KYC process​ (CoinGape)​.

KuCoin P2P: KuCoin offers a P2P marketplace with no transaction fees, making it a cost-effective option. It supports multiple fiat currencies, including GBP, and provides a secure trading environment with KYC-verified traders. The platform's mobile app is particularly user-friendly for P2P trades​ (finder.com)​​ (CoinWire)​.

Bybit P2P: Bybit is another option with a quick transaction process, often completing trades within 15 minutes. It supports several fiat currencies and major cryptocurrencies. Bybit's P2P platform also features zero trading fees, making it a competitive choice​ (finder.com)​.

Paxful: Paxful is known for supporting a wide range of fiat payment methods, including GBP. It allows users to trade Bitcoin, USD Coin, and Tether. Paxful is particularly useful if you need flexibility in payment methods, such as gift cards and bank transfers​ (CoinGape)​.