Hey amberee
I think the most important thing is that you are clearly passionate about studying psychology. If retaking the year is your only choice then be sure to make the most of it.
It is best to apply to a range of universities.. i.e. two "top" unis for you to realistically aim for- somewhere where it will be a challenge for you to be accepted but possible nonetheless, and 2 middle unis where the grades are more attainable and one back-up..
I don't think Kings teach undergrad psychology, whereas UCL usually take students with AAA/AAB
Manchester & Southampton are good universities & Surrey also has good reputation
You should also consider doing relevant (psychology related) work experience/ voluntary work/ extra curricular activities to really stand out from the crowd and to persuade admission officers to give you a chance
I wish you the best, work hard & you will be successful