All I can pick up from that website is ‘Sangria = Jelrafloki. I have also seen both of these names in the https://www.rhs.org.uk/Search?query=Jelrafloki website, so have added this rose. It seems to be yet another Sangria and four of them is enough to drive one to drink. No parentage is listed that I can see - you have quoted (unnamed+ Jelvanica). Do you recall the source?
We have: 1966. Sangria ® Flori MEIestho (Fire King x [Happiness x Independence]) ?1977 Jelvanica - possibly bred by Robert Jelly. <1984 Sangria JELrafloki HT. Red (unknown x Jelvanica) 1986 MEInobroc HT. (Jacqueline x [unknown x Jelvanica]) 1992 Sangria 92 HT MEItorpo (Jacqueline x [Meinobroc x Jelvanica]) 2000 Sangria. Flori pink. MEIprille (unknown x unknown)