After operation of the JET machine with the MKIIa divertor samples of dust and flakes/deposits have been removed from the divertor region for analysis. Flakes/deposits up to 40mm thick have been found in the inner leg of the divertor. The flakes/deposits formed on cold surfaces shadowed from the plasma. The flakes were found to be mostly carbon saturated with deuterium to a D/C ratio of 0.4. Analysis of the material removed has shown that it contains significant fractions (~ 4%) of the tritium (produced by d-d reactions) and deuterium introduced in the JET machine during this period of operation. Dust material has also been collected. Vacuum cleaning collected very little material but a significant quantity of material was collected by smears. The analysis of this smeared material has shown it to be of a very similar chemical composition to the flakes but to contain a significantly lower inventory of tritium. The dust has an average particle size of 27mm and a specific surface area of 4 m2/g. The vast majority of this material is associated with co-deposited layers in the divertor region. The dust is on average present at a level of 120mg/cm2.