In relating the density scrape-off layer thickness ln to D^ to , account is taken of two aspects of the JET configuration: (a) the poloidally-varying cross-section of plasma flux tubes in the scrape-off layer, and (b) the different limiter configurations-discrete/ continuous. Edge measurements of l n(0) in JET made by Langmuir probes and limiter-viewing cameras are used to deduce edge values of D^ to for ohmic discharges, over a range of conditions, Ip =1-5MA, ne = 0.7-6¥1019 m­3. Generally the values are found to be close to D^ to = 1019/ne m2 s­1, that is, Intor-Alcator scaling.