>I just wanted to know roughly how long waiting lists are
This probably varies depending on how well-established the breeder is, how much demand there is for their pups etc etc. That's how it is in pretty much all breeds.
> In an ideal world I'd love a blue roan/liver roan/chocolate girl to potentially compete in agility, but with their dew claws and tail in tact (not sure how controversial this is).
It is much less controversial than it used to be, but probably hardcore gundog breeders are still docking every puppy and might not like that request. The thing is: If a litter is going to be docked, and you request one not to be docked, then the choice about which pup is yours has to be made when they are 3 days old. You might have to pay in full at that point for the pup - or at least pay a hefty deposit. And who knows if that particular pup is going to grow up to be the pup you would have chosen otherwise, or suitable for agility in other ways - no one can tell anything at 3 days old. So your best best, is to find a breeder who isn't docking any of the litter - so that you then you don't need to be assigned a pup at 3 days old. This may well exclude looking at hardcore gundog breeders, but you should be able to find a very well bred bitch with a lot of red in her pedigree, who was placed in a pet (or agility) home and having a litter - whose owners won't dock. SO genetically you can still end up with pretty much the same.
I don't know much about dewclaws and working cockers, but I don't think they are removed anyway? My hunch is that if a breeder isn't docking, they probably aren't going to do dewclaws either.
>A second question: I'm probably fairly young in comparison to most potential owners (I'm 22, partner's 24, I've previously had 2 family labs from pedigree show & working lines, did agility recreationally with the show lab but she was a bit of a social butterfly and I didn't have the time to commit to competing). Is my age going to be worrying to potential breeders?
As a breeder, no - this is perfect. My only concern, would be whether you have plans for children in the near future (next couple of years).
>Also I currently don't have a garden (4 room house) but will probably move before the puppy depending on waiting times.
Again, wouldn't be a problem for me as long as you have somewhere outside the house you can take the pup for toilet training - even on leash. You don't want to be toilet training indoors using puppy pads because you are terrified to take the puppy out even to toilet before vaccinations are finished.
Most dogs just lie around all day, if they have adequate exercise and mental stimulation - outside the house. So the size of the house and garden, really isn't important to me. The surroundings and whether you have access to public areas where the dog can be trained off leash, would be important.
>Based on these factors, firstly how long would you suspect a waiting list to be? 1 year? 2 years? more?
Gosh ,that's absolutely impossible to say. But breeders' plans do change - so keep that in mind. Once a mating has happened, you can be pretty sure there will probably be a litter arriving - but before that, people do say they will breed a bitch and then change their mind for whatever reason or decide it's not convenient after all - and if you've been waiting 2 years for them to breed her, that can be kind of hard. If I were you, I would be looking for breedings which have already happened. (And I say this as someone who has had a waiting list for 2 years for our own next litter!) There are some good Facebook groups for working cockers where litters are advertised, so you might want to join those...