British holidaymakers should take extra measures to secure smartphones and laptops abroad following a series of cyber attacks on hotel Wi-Fi networks across Europe, GCHQ has warned.

The agency's National Cyber Security Centre (NCSC) said travellers should avoid "insecure" WiFi networks and set up "two-step verification" for emails, typically meaning that accounts can only be accessed using a pin number sent to the user's mobile phone.

The warning came in a "threat report" highlighting claims that hotels in at least seven European countries have been targeted by Russian hackers.

The Sunday Telegraph understands that MPs are separately now using a two-step system to access emails from abroad, including by using finger-print scans on their mobile phones, following a major cyber attack on Parliament earlier this year.

The NCSC report highlighted claims that Fancy Bear, the Russian group behind the hacking of the Democratic Party's emails during the US election, was behind a wave of attacks on the "hospitality sector" across Europe, beginning last month.

A spokesman said travellers should "use a strong, separate password for your email and install the latest software and app update" on smartphones and other devices.