For those who can make the most of it...
At the very least i assume you buy fuel and/or railway travel.
Keep the balance topped out (there is nowhere better to stick £20k really at the moment) and even in a zero direct debit situation (not sure how you have engineered that, i would love to not have any direct debits, i have absolutely loads ) you will make 3% cashback on fuel/rail spend, 1% cashback on supermarket spend, and £50pcm gross interest on the balance. The credit fee is waived as an account holder