Only if the car is still available, so ask as early as you can rather than on return day. Extensions are arranged through Autofusion and charged at the listing's daily rate, with any longer-hire discount applied.
How to extend
Call or WhatsApp +44 141 899 0009, 24/7. See can I extend my hire period.
If it isn't available
Return the car on time to avoid late charges. See what happens if I return the vehicle late.