A detective is a police officer, same rank.
As mentioned above, there are now entry routes whereby you join as a detective. There are routes whereby you can gain a degree from the job, or join with a degree and you’ll have a shorter probation period.
In all honesty, those degrees won’t really help you when you’re in the job. It would be better for you to join as a PC, and then apply to become a DC, that would be more beneficial.
Just my opinion.