Or do I need cover for more than just the excess?
”Excess Protection £ 18.00 / Day
Excess Protection (EP) is an optional coverage available only if Damage Waiver (DW) is included in the rate or purchased. EP reduces the applicable Damage Waiver excess amount. If EP is not included in the reservation, it is available for purchase.
For all cars and SUVs in the categories Mini, Economy, Compact and Standard, the excess can be reduced to 100 GBP. For all other vehicles, the excess can be reduced to 250 GBP. The excess will be charged every time a vehicle is damaged, lost or stolen.
Before purchasing EP, it is advisable to determine if the renter's personal coverage is adequate to cover damage, theft, loss of revenue, administration fees, diminishment of value and any towing, storage or impound fees. If EP is declined, the renter will be required to pay these charges up to the Damage Waiver excess amount and seek compensation through their carrier of personal coverage. Excess Protection (EP) is not insurance.”