Housing-market tightness is the ratio of revealed search demand to listed supply, θ = enquiries ÷ listings, for each travel-to-work area (TTWA). Choose a year, market, and view to see where the market is tight or slack, or the significant hot- and cold-spot clusters of tightness (local Moran’s I, conditional-permutation significance at p ≤ 0.05). The panel beside the map lists the tightest and slackest areas in the chosen year; the two charts below track how unequal (Theil index) and how spatially clustered (global Moran’s I) tightness has become since 2018. Tightness tends to diverge before price levels do, which is what makes it useful as an early indicator. The enquiry data cover England densely but Scotland and Wales much more thinly, so θ is most dependable for England.