1. If you have a British passport you’ll need at least 6 months remaining and it must have been issued within the last 10 years

You can check the validity of your passport on the UK gov website here.
Be sure to do this as you may be surprised by the result. My passport expires July 2022 and I’ve discovered I can only travel to Europe up to early December 2021

2. Healthcare – The European Health Insurance Card (EHIC) which provided us with reciprocal care, may not be valid from 1st January 2020. You will have to purchase travel insurance with adequate health cover

3. Driving – You may need an International Driving Permit. You may need more than one depending on the countries visited. Each permit costs £5.50 and is available from the Post office , details here

4. Driving – You may need a physical Green Card from your insurers. Your insurer may make a charge for this. You may also need GB stickers

5. Travel with Pets – Pet Passports will no longer be valid. Speak to your vet at least 4 months prior to your trip

6. Mobile Phone / Data … Check with your provider whether data roaming charges apply