Shark,
I have to echo Rainboe's & Shack37's comments, the UK is not a friendly place just now for someone like yourself unless you have a very wide and well established support framework. It is extremely dififcult to find work for those who have good, practical degrees just now, unless they also have a lot of experience - my girlfriend can testify to this, even although she has a good degree she's still struggling to get a start since she graduated last year.
Coming from Canada, you either need to do a lot of legal work and get yourself a work permit, and arrange a bona-fide job and somewhere to stay, both of which will be checked by immigration when you arrive, plus have sufficient funds to support yourself for a few months in case things don't work out (which in London probably equates to around ten to fifteen thousand dollars).
Alternatively, you can hit lucky and be entiteld to dual nationality, which my cousins were, but unfortunately, there's a time limit and you have to have applied by the time you're eighteen. HOWEVER, this doesn't get around the sufficient funds, somewhere to stay & the genuine job offer.
I don't want to rain any more on your parade, but there is also potentially another fly in the ointment regarding the job, in that any job offer may well have to be for one that someone in the UK cannot do, or there is a recognised shortage of specialist or uniquely qualified people in the UK. Your qualifications to perform this work will then be examined in detail prior to you getting in to do it.
As someone who travels to the US & Canada on a pretty regular basis, my own advice would be to seek opportunities in your own homeland. It's a wide land with a whole wide range of possibilities - try looking outside your own province if you want to roam. You can go a couple of thousand miles without having to change currency, banks or insurance which are (take my advice) major pains in the £$$.
I am afraid that the world is hugely unfair and set against you at this point in time & although I don't know your exact circumstances, I hope that you reconsider your "disapppear without trace" plan, get some good qualifications and use what look like roadblocks to you just now as motivation.