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The biggest catch is the annual fee as it does mean that the first £24 cashback you earn over the course of a year won't go to you. That said, providing you spend a reasonable amount on the card you're likely to be able to cover this and still earn a fair amount.
Another stickler, however, is that a monthly maximum does apply to the amount you can earn at petrol stations.
You'll only be paid cashback on the first £300 you spend on fuel each month. So while the limit is relatively generous, if you drive a lot then it may be worth getting another cashback card to use at the pump once your petrol or diesel purchases have exceeded this amount.
Similarly, as the Santander card only credits you with cashback when you spend with certain retailers, you may want to consider applying for another cashback credit card to cover your purchases elsewhere.
Finally, the 18.9% p.a. rate of interest applied to purchases is relatively high compared to the other cards out there. It's for this reason that you need to make sure you clear your balance each and every time you get your statement - do this and interest will never be an issue.