Just received this from
FGW▸ , who are also sorry for the disruption this is causing to passengers :
In terms of background we had some serious track circuit problems at a few locations between Romsey - Salisbury since Sunday and initially it was believed to be connnected to contaminated railhead due to leaf fall. However, NR» are not satisfied that this is the cause and clearly technical testing needs to be concluded. This has resulted in the introduction of " block working" in the area and hence delays and some services having to be withdrawn due to congestion.