I'd recommended going for your Class 1 as well if you are wanting to go commercial. I was doing my PPL last year with the intention of going commercial, I took others advice and went in for my class 1 which I failed !!! the first thing we covered was Colour vision, failed on the plates and CAD, that was the end of that, medical £350 and travel costs of £130 to be there only for an hour, didnt even get an option of a restricted medical which I know wouldnt let me fly commercially but at least Id still be able to continue doing my PPL.