There have been reports of private collectors or former production members possessing 11 of the 13 episodes on VHS, though a complete, high-quality "new" digital archive remains unofficial. Season 4 Episode List
listings exist, many files are mislabeled or represent only a fragment of the 13-episode run. Season 4 Episode List mind your language season 4 internet archive new
The Internet Archive operates under "controlled digital lending" and fair use for abandoned media. ITV has not officially released Season 4 since 1986. No one is losing money because no one is selling it. However, if you live in the UK, use a VPN if you are concerned about copyright trolls—though historically, the rightsholders have ignored this revival for three decades. There have been reports of private collectors or
When searching the Internet Archive (archive.org), use specific search terms to find the correct episodes. The 1986 revival is what you are likely looking for. ITV has not officially released Season 4 since 1986