Not really. Tagging is not an unusual bail condition used in the UK.

Tagging is available as a condition of bail in support of a curfew condition. The monitoring will ensure that compliance with the curfew can be checked and that if a curfew is breached the police are very quickly alerted.

The intention of the Home Secretary in making tagging more available is that it should be used as an alternative to remand in custody.

There are no statutory minimum or maximum curfew hours for bail cases. Nor is tagging of adults restricted to those who are charged with imprisonable offences. The Bail Act 1976 as amended restricts tagging of juveniles to those who are charged with offences which would be imprisonable offences for adults.

Tagging is not tracking. It does not provide continuous information on the whereabouts of the subject. An alert is generated at the supplier’s monitoring centre if the defendant leaves the curfew address during the curfew period set by the court, or removes or tampers with the tag.

It's there if someone is deemed to be a flight risk or if they have a curfew. Considering that Assange then proceeded to flee 'UK soil', I would say it was a fairly appropriate action. We couldn't comment on the 'alleged Yugoslavian war criminals' because we don't know who he is talking about or what conditions were imposed on them, or why.