Finsbury Park Mosque under Construction

This picture was published in June 1989. However, the mosque apparently opened in 1988. So it may have been shot the previous year.

The following history extract from the Wikipedia article:

In the 1960s a small room in a guest house at 7 Woodfall Road, London N4 was used as a Prayer Room and community centre for the handful of Bangladeshi Muslims then working and living in the district, and had become inadequate for the growing Muslim community by the time the building was compulsorily purchased by the local authority as part of a Housing Action Plan. The community formed a Muslim Welfare Centre, and in 1975 purchased its own property at St. Thomas’s Road, later also acquiring neighbouring plots. A mosque first came into use on the site in 1988, when it was one of the largest mosques in the UK.