Number one sounds perfectly natural. For the second, "tall" comes before "blonde." As for the other, I wouldn't say "big-legged" actually because that sounds fat. Do you mean long-legged? I think it doesn't matter which order you use, but I would lean toward "long-legged, blond British man." I don't know if there is a rule, but maybe because we sometimes use "blonde" as a noun meaning "person with blond hair" so it feels natural for other adjectives to come before it rather than after it. I hope that's a little helpful.