You have said you're planning on taking: Spare inner tubes, Jet pump, Multi tool kit, Tyre levers, Gel bars, Fluids, Cash & Card
So you've covered flat tyres, energy, hydration and money.
Other suggested repair items: chain tool, quick links, spoke tool, zip ties, strong tape.
Unforeseen circumstances: mobile telephone/cellphone, emergency contact information, rain jacket, hat/gloves
First aid: some disinfectant wipes, a tube of antibiotic ointment, 2 or 3 sticking plasters, a gauze pad and a tiny roll of tape. Tweezers.
Daytime Running Lights - You haven't mentioned time of day or season, so consider DRLs for daytime riding and if there's a risk of being caught by sunset. (Personally I use DRLs all the time, and keep some other lights for night time.)
Lock - Is there a chance you'll leave your bike unattended? A small bike lock might help if you choose to duck into a shop or cafe.
Even if you cover up or apply before you leave, a small tube of sunscreen will allow you to reapply on your face, ears, backs of your hands or any other exposed skin. A number of people I ride with also use a SPF chapstick.