Hi
Suggestion. When you have round up activated on your account pennies will move into your savings from your main account once rounded up to the £. However the same doesn’t happen when you split a bill, so if I have it activated I spend £1.90 at Sainsbury’s £0.10 will move into my savings however if I split a bill with someone and they request £15.90 the balance isn’t rounded up.
I think you should have an option to round wvery payment up. Not sure if anyone else is like me and uses round ups for my OCD 
but if you do then you will understand how frustrating it is when you split a bill