Please read the information form the government regarding Brexit.

Passports: check your renewal date

You may need to renew your British passport earlier if you’re travelling after 12 April and there’s no deal.
You should renew your passport if, on the day you travel, your passport either:
has less than 6 months left
is more than 9 years and 6 months old
If you do not renew it, you may not be able to travel to most EU countries and Iceland, Liechtenstein, Norway and Switzerland.
You can use a tool to check whether your passport is valid for the country you’re visiting.
It usually takes 3 weeks if you need to renew your passport. There’s a premium service if you need it sooner.

Healthcare: check you’re covered

Whether there’s a deal or not, you should always get appropriate travel insurance with healthcare cover before you go abroad.
If there’s a deal, you’ll continue to get state-provided healthcare in the EU if you have a free European Health Insurance Card (EHIC) card. The scheme also covers Iceland, Liechtenstein, Norway and Switzerland.
If there’s no deal, your EHIC card may not be valid.

If you have a pre-existing medical condition

The EHIC scheme covers pre-existing conditions, while many travel insurance policies do not.
If there’s no deal, your EHIC card may not be valid. It’s important that you check your travel insurance covers your condition. You may have to find a specialist insurer to cover you, depending on your condition.