https://www.nationwide.co.uk/current-accounts/flexplus/travel-insurance/
Upgrade your travel insurance
There may be times when you may need to increase some of the limits or extend your cover.
Before you travel, make sure you have the upgrades you need to cover your trip. Aviva offer 4 different upgrades:
cover for pre-existing medical conditions
longer trip cover for trips over 31 days
extended cruise cover
increased cover for cancelling or coming home early
Any upgrades you buy are only valid while you qualify for FlexPlus travel insurance. They have the same terms and conditions as the standard policy.
To ensure you’re fully covered, consider buying your upgrade when you book your trip.