Found 2 exchanges where Tezos is traded for GBP. According to the data on 1 September the most optimal price to exchange XTZ for GBP is £0.158 for 1 Tezos. This rate is fixed at CEX.IO at the maximum trading volume of the pair XTZ/GBP - 16.6 GBP.
Selling and buying Tezos (XTZ) for British Pound Sterling
To buy Tezos, use the table above.
The maximum daily trading volume is observed in the XTZ/USDT trading pair at Bitci and reaches £ 2 092 561.29 (2.3% of the exchange's total trading volumes) at the price £ 0.16 per 1 XTZ.
The minimum price to buy XTZ for GBP is 0.158 - on the exchange CEX.IO.
The maximum price to buy XTZ/GBP is 0.159 - on the exchange Coinbase Pro.
Warning: some XTZ markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.