hi there vvvv,
the MCAT are usually not required at all, but some schools might not mind knowing your scores, specially if they make you look great.
thought the MCAT isn't requires, as you may/should know, the UKCAT is a requirement for most if not all programs today.
You will need to fill out the UCAS online application and make sure that the schools have all materials they might expect from you such as your transcripts etc..., once they received your application from UCAS.
the UCAS applicaiton isn't that bad at all. it is cheap, easy to fill out and require only one personal statement and one reference letter (also can be done online).
if i were you i would contact all the universities you are interested in applying, after reading through their websites, with specific questions you might have about eligibility. one major difference between applying to UK med schools vs. US, is that you can only apply to 4 med school programs at first and if rejected by all you may have a go at another. therefore, you must choose "wisely"
there is a great website for UK medschools and students, much like this one in breadth and depth of information, it is
http://www.newmediamedicine.com/
good luck!
sumina
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applied UCAS 2005 for deferred entry in 2007 - 1 offer, 3 rejections