Some digital banks offer the option of rounding up on a sale. So if a sale is 19.75 GBP they will round up to 20 GBP and the 25 pence they rounded up is put into your savings account. Will fidor be offering this option ?
If I receive tips from customers, I put the money into a jar at home, and then once its a third full pay it into a savings account and forget about it. At the end of the year when I have expenses like car service I have saved enough to cover it. If there is any change left over its enough to pay for a meal out for my partner and myself.