Indicator detail
Concentration Index
Measures how concentrated listing activity is among repeat advertisers within a monthly snapshot.
Latest month
2026-05
Latest series value
30%
Coverage
13,081
Method
The published outputs include top-share measures and a Herfindahl-Hirschman style concentration score.
Interpretation caution
Concentration may reflect agencies, reposting strategies, or market structure, not ownership certainty.
Largest latest regions
Regional context
East London
Incall £100 | Intimacy 89%
1,446
West London
Incall £100 | Intimacy 95%
608
North London
Incall £120 | Intimacy 92%
504
North West London
Incall £100 | Intimacy 93%
496
Birmingham
Incall £120 | Intimacy 88%
417
South West London
Incall £120 | Intimacy 92%
361
Central London
Incall £150 | Intimacy 91%
315
South East London
Incall £120 | Intimacy 93%
280