Grammatical error - hence ambiguous. Do they mean, they want it mandatory for all cyclists to go at 20mph? The cagers will probably pick up on this. Pity that these petitions are slung out without more care being given to the wording.
Cycle training for all? (I don't think the petitioner means that.......or did he?). The next thing the government will want to do is to introduce a cycling test before being allowed on the road. Still, I'm sure it will be a bargain at only £50 per test.
The petition is too vague. Speed limit of 20mph (that'd be good on say, Birchfield Road wouldn't it?) on what types of road? What types of road justify higher or lower limits? How's it going to be enforced?
The City Centre is a 20mph zone now and the whole thing is a joke - its universally ignored unless traffic volumes are such that it brings the speed down. West Mids Police won't bother to enforce it either.
If it actually gets to the point of having enough signatures to generate a reply (which I doubt) it'll say: £140m for Cycle England, and that most towns have cycle networks (admittedly of the off-road variety).
A good starting point would be to enforce the limits that we've got now. Until they are enforced and adhered to, trying to lower them is a waste of time. There's a 20mph zone in Birmingham City Centre and its completely ignored.