Is there more than one rose known as 'Betty Cuthbert'? Treloars is listed as a seller of this rose here but the rose they show has a Kordes variety name and is a soft apricot.. doesn't look anything like a Roundelay sport. See: http://www.treloarroses.com.au/products/product.asp?pID=5576&cID=8 . There is no reference to 'Korbrespo' here on HMF.
KORbrespo is the Kordes shrub rose 'Schloss Eutin'. It seems that a new name has been given to it for marketing in Australia. What a nuisance that they took the name from an earlier Australian cultivar!