Strictly Orthodox rabbis in London have set up a hotline to report any breaches of decency among the ranks of the community.
Notices have gone up in synagogues in Yiddish and English advertising a mobile number on behalf of the new Va’ad L’Toihar Hamachneh, Committee for the Purity of the Camp.
Locals can report any "suspicious" person or place which they believe has "breached the walls" of modesty and holiness.
A spokesman for the Union of Orthodox Hebrew Congregations said that the committee was not a UOHC initiative as such, but had been launched by a number of its rabbis in response to “public demand”.