Cor, rotavate or not to rotavate, that is the question, and it is a question that has been raised here several times. I personally am a hand digger kinda chick - back breaking, but thorough. Our first plot, many years ago, was covered in couch grass, which we strimmed, then rotavated in (I hear your gasps, but we were still learners), and what happened, the bind weed and couch came back with avengance as all we had done was shredded all the roots and produced millions of cuttings, which had all grown! We never conquered that plot :'(. New plot, Ava strimmed, then I dug, and dug and dug, but now it is clear, well, apart from the occassional marestail, and now I would possibly rotavate, if I owned one.
Anyhow, after all that mindless rambling, welcome and congrats on your new allotment.