London Stock Orders saying expired

Hi Matthew,

I placed a number of orders this morning and only 5 got filled, the others then said expired after i inputted them. Initially they said working, and then expired. IS there only a set amount of codes that are supported for LSE stocks. The codes i was trying to put in canbe found at my model page - [LINKSYSTEM_55824512]

Please confirm the universe of stocks that it covers. thanks