After the initial operation of the JET MKIIa divertor deposits/flakes of material were discovered on the inner leg of the divertor which had not been seen before in previous divertors at JET. The flakes were found to contain significant quantities of hydrogenic material. After the DTE1 a much higher long term tritium retention was found than was expected based upon pre-MKIIa experimental data. The outgassing rate of tritium from the JET vessel after venting was also higher than expected. Both the higher than expected retention and the high outgassing rates are attributed to the deposits/flakes. The retention of significant quantities of tritium in tokamaks represents a major concern for the operation of machines like JET and for future machines such as ITER. If the retention is too high then methods are needed to remove the tritium before it reaches unacceptable levels. The aim of this work was to locate and quantify the material present in these deposits/flakes and to characterise the deposits/flakes present. In addition methods of removing these flakes/deposits during the Remote Tile Exchange (RTE) were sought. The analysis of the material collected will provide the data base for future machines to deal with these deposits/flakes, either by design modifications to stop the films being formed or to identify potential methods of removal of the films.