Had a busy few days, so I apologise for the delay in replying. Thank you all for your help, a lot of good advice, this seems like a great forum, filled with helpful members.
I have put the mower back together at this stage, and will bide my time for the next council pickup and see what is available (no point paying for parts that are just being thrown out anyway, fingers crossed). This will give me a chance to do some reading on the forum too. If I can't find anything on the street, I might see if I can pick something up from the local tip, looking for an aluminium base sounds like a good idea too.
Gadge,
I was worried someone might say I need to suck the air in, instead of blowing, mmmm...old carby flavour...lol.
Thanks again to all, for all your help.
Cheers,
Camo