
Depends on the breed. some breeds do not have Championship status in the UK, so any Champions will normally be those abroad behind imported stock, or when the dog is shown abroad.
You should expect a sprinkling of them in each generation, but some of the best producers are not champions, and some of the best Champions never produced the best stock.
Looking at my own pedigrees I would expect say a third to two thirds of the names to be red, and if there are American imports and Champions listed it is not uncommon for an all red pedigree, but that is because it is far easier to get a title than in the UK. If the breed is a very popular one, then there will probably be fewer champions in the pedigree, as good but non champion dogs will be used more for breeding.
Stud Book numbers listed will give you an idea if the non Champion ancestor was a quality one, as well as the dogs carrying affixes (kennel names) rahte than obvious pet stock names like 'Lady lucy' wheras having an affix on lady Lucy eg Gobledygook Lady Lucy, whosw Mum was Gobbledygook Lucy Locket out of Gobledygook Pocket Locket, would show that the breeder is at least breeding a family line and prepared to pay for the priveledge each year of maintaining a Kennel club affix at £20 per annum (whether they breed that year or not) and will have cot over £70 (I think that is what it costs now to apply for an affix) to purchase in the first place.