Raymond Horne, 61, has not set foot in the UK since he was a five-year-old boy.
Horne, with head covered, was detained on arrival at Heathrow
He arrived back in the country under an airline blanket and under suspicion. Horne is a convicted serial paedophile, deported from Australia, where he has been in and out of the prison system since 1965.
He will be put on the sex offenders' register but what other measures will be placed upon Horne? And what can he expect in return?
SURVEILLANCE AND SUPERVISION
Upon landing at Heathrow Airport, Horne was immediately detained by British police. They will have interviewed him, and any relevant information will be passed to the police in the area where he is proposing to live.
The Sexual Offences Act 2003 introduced a new civil order designed to ensure that those convicted of sex offences overseas are made to sign on the sex offenders' register in the UK.
In order to go onto the sex offenders' register a person has to appear in court, and it is likely Horne did so on Thursday, the day he arrived in the UK.
Registered sex offenders must report to the police who may visit them in their homes. Horne could face up to five years in prison if he moves, or if he changes his name without notifying the police within three days.
Horne could also be made subject to a sexual offences prevention order (Sopo). This applies to offenders convicted of sexual or violent offences overseas, and who pose a risk of serious sexual harm in the UK. Again, this would have to granted by the courts.
A Sopo not only obliges offenders to sign on the register, but it also bars individuals from being alone with children or from being within a certain distance of a playground. Breaching the order carries a maximum of five years' imprisonment.
Britain's most dangerous sex attackers are closely monitored by police and probation services. The authorities will have to assess whether Horne poses a low, medium, high or very high risk and allocate supervision accordingly.
Sex offenders in England and Wales are monitored under Multi-Agency Public Protection Arrangements (Mappa) by a team including police, probation officers, medics and social workers.
The latest figures show that there were 30,416 registered sex offenders under Mappa arrangements in 2006-2007. This represented a rise of 1.4% from the previous year.
Of this total, 558 sex offenders were judged to pose the most serious risk, needing frequent scheduled and unscheduled meetings with their monitors. In some cases, 24-hour surveillance of offenders is undertaken.
PLACE TO STAY
According to the Home Office website, there are more than 100 approved premises where high-risk offenders are closely supervised. It is not known whether Horne will be moved to one of these premises.
MONEY TO SPEND
The Department of Work and Pensions says that benefit entitlements for sex offenders are worked out on a case-by-case basis and would depend on several factors, including circumstances, savings and age.
A spokeswoman said Horne would not automatically be disqualified from benefits because he was a convicted criminal. But she added the fact that someone may have spent much time abroad is another factor taken into account when claim applications are being processed.
Shy Keenan, of child abuse victims' campaign group Phoenix Chief Advocates, said Horne will probably be given contact numbers for local charities who will help him with housing and food.