Former Hey Dad! star Robert Hughes has appeared in a London court after being arrested over a string of alleged sexual assaults.

London police arrested Hughes, 63, on Thursday morning (local time) on warrants issued by New South Wales Police.

He faces charges, including 11 counts of sexual assault and indecent assault.

The arrest is the result of a two-year inquiry by Strike Force Ruskin.

The strike force was established in 2010 after Sarah Monahan, the actress who played Hughes's on-screen daughter, first alleged she had been touched inappropriately on the set of the hit show.

Mr Hughes appeared in court before district judge Michael Snow for a brief hearing, wearing an open neck blue shirt and dark blue cardigan.

He confirmed his name and date of birth before his lawyer asked for more time to consider the case.

The hearing was set to resume later in the afternoon (local time).

Hey Dad! aired on Channel Seven from 1987 to 1994.

Police will allege the sexual offences were committed against five girls between 1985 and 1990.

New South Wales Police worked with Scotland Yard to make the arrest.

Australian authorities will be seeking to extradite him to New South Wales.