I'm surprised the description of this rose does not mention scent. As it is, this rose looks identical to what one might call John Nieuwesteeg's KAV, which has a very strong, pure tea scent, one of the best I've come across. Sure, scent varies a lot, but it would be striking to someone sometimes if Callimore were the same.
more descriptive information is to come, Patricia kindly opened a file with bare bones information. the fragrance is not "tea" though, its definitely sweet HT style - hopefully Margaret will have some observations on the fragrance.
John N once suggested Kootenay for "Henry Vaughan", but doubt has been cast on the ID of our "gold standard" plant of Kootenay anyway. I'll check the "Henry Vaughan" in my garden when I can smell again (it's cold-and-flu season), but my nose isn't as trained as Billy's.
For what it's worth, the JN Kootenay at Maddingley Park is nothing like the JN KAV there. Much messier, usually balled and with weaker scent. Above all, the petals at the bud stage are not apple green. But eyeballing the photos, his KAV looks exactly like your Henry Vaughan.
On the scent of KAV, Quest-Ritson calls it “Strong and tealike”. Peter Beales just says ”a delicious perfume”. On the ID of Callimore, the evidence for KAV (not just John Nieuwesteeg's KAV) is strong. Few of the American or European photos show just-open buds, but the ones that do, e.g. Sangerhausen's (http://www.helpmefind.com/rose/l.php?l=21.208455), are plainly apple green. More: the thorns point slightly down and on the current year's growth they are red. Are they the same on Callimore?