experiment hasnt worked before - if you resigned
if there was a mass-firing, then it is useful to contact them to say after a few weeks, can I have my job back? - by then they have found out who was turning in a decent days work! [god no this isnt a joke]
yo are not in that category so dont go back
BUT if you are adamant, ring up someone who is there and ask if it has changed
and yes in the NHS we have told re-appliers, 'nothing has changed.' = he is still there.