Dispatching in London is a bit sketch.
I have had two mates who worked as couriers in London, and a load in Dublin. Both of the london lads had a fair few offs, both of them had one pretty serious off.
Emm. Yeah. London is dangerous enough mate. I think the money is alright though. Once you get into the swing of things, learning the streets etc. Dublin, predictabley enough I suppose, seems safer. Again though, mates of mine have had serious offs doing it. But, in fairness, that was after a good few years. One guy wrote off his Super Tenerie ;*( and his liver. Except, your liver grows back. So he was grand. Just had to stay off the drink for a while.
I am not saying dont do it. I wouldnt advise against it, just these are the lads I happened to know... so... there you go. They all loved it too. They would go off, and get other real jobs after a fright or whatever, and be back scumlording it again with the lads on the road in a month or two.
EDIT: Oh. Hold on. DAS? Does that mean he is a learner? Emm.. if you are just learning, (thats what DAS means?) no way man. The lads I knew were bikers since they were young, like 10, learning on farms rounding up sheep and ****. If you are not completely confident, then I would advise against it.
(And, I sort of define confident as does your bike feel really light to you, almost so you dont notice the wieght around bends, like you can just chuck it about, stand on the frount wheel when you need to, drive it with like your body, and not your arms...And, you should have had a few offs too. You have to have crashed a couple of times to sort of learn how to not get hurt as much. Then... give London a lash.)