my dear friend, no need to pay extra money. go to web site www.cic.gc.ca and download the form for Immigration for Federal Skilled Worker. fill it on Computer and print it out. Attach your Qatar Id copy. make a bank draft of CAD 500/- (first check on website what is the current application fee i think it is still CAD500) which is equivalent to around QR. 2000/- and finally send it to London address of Canadian Embassy. check the London embassy address on the website. Doha Bank main branch knows to which name this bank draft to be. if u need confirmation u can get this bank draft detail from web site itself.

your Application Form, Qatar ID Copy and Bank Draft just keep in envelope write the address of Canadian Embassy in London and send by normal courier. normal courier will cost you Qr.12 and if you want to send it by DHL or anyother courier service it will charge u QR.500.

any more information required, let me know.