I agree with the other posters that with low hours it really is a huge step up. I had around 150 hours TT and no complex experience when I did my MEP and it was one of the steepest learning curves I have faced through my flight training.
I did get the rating, but the next hurdle was finding a flying club that will let you take the aircraft solo, most of them are very wary about letting low hour pilots fly their twins without an instructor, and most clubs twins are booked solid for instrument training.
One club thats not to far from you that would let you hire their twins after a checkout is FlyingTime based at Shoreham, they have an Aztec and the DA42 Twinstars for £312 and £240 respectively, their website is -
www.flyingtime.co.uk
Just to mention that from memory training towards an MEP in a DA42 restricts you to flying just that type due to it having FADEC as opposed to VP, though I may be corrected.
Best of luck! 