McGuire thought he had got away with his horrendous crime when he was originally acquitted over 25 years ago.
"However, due to the advances in forensic technology and new legislation under Double Jeopardy, Thames Valley Police and the CPS were able to prosecute him and he has finally been punished for his crime.
“His guilty plea shows he knew the evidence against him was too strong to deny and I am pleased with the sentence handed out to him.
“I would also like to pay tribute to the victim, who was very supportive of the re-investigation."
Rapist Alexander McGuire begins an eight year jail sentence, 26 years after the crime, after DNA evidence helps convict him.
A sex attacker acquitted of rape in 1986 will be sentenced for the crime in Windsor today, following the discovery of DNA evidence.