3 ASs vs 4

Not sure if this is the right place but anyway.
There was a clash with the subjects I wanted to do for AS this year so I can no longer do the combination I wanted to (English language, psychology, history, Spanish). At the moment the most likely option is to drop psychology but I don't know whether to pick up another subject in its place.
I guess what I'm really asking is do I have a realistic chance of getting into a Russell group or possibly Oxbridge uni with only 3 ASs? (Plus EPQ). I often hear people say "you don't actually need 4ASs" but realistically would I be put down against another person with the same results who has done 4 ASs?
Thanks in advance for your help.

A very small number of universities ask for a certain grade in a fourth AS subject as part of their entry requirements for certain courses. As long as you're not applying to them you don't need a fourth AS subject, but not having one would probably be noticed if you applied to the likes of Oxbridge and they might wonder why. But you can always pick up a fourth AS subject next year when the timetable might not clash!

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Not sure if it's an option where you are but my school lets us 'cluster' if subjects on our timetable clash, ie. doing one of your subjects at a different local sixth form and the others at your main college, if the timetables don't clash