From the clubs website...
We expect to receive confirmation from the Football Association of the date and time of our FA Cup semi-final later today.
As soon as we receive that confirmation, we will advise supporters. We would expect to go on sale with tickets, very soon after the announcement...
Don't think the delay will have anything to do with the London Marathon, the date was fixed over 12 months ago, the date for the 2024 London Marathon has already been confirmed. As others have said maybe the delay is to do with the other semi, presume they don't want an early kick off as both...
Its to do with copyright stuff, you have to pay to show the game live. Not worth the club paying for it, as if you are there you are already able to watch in 4D.
Worked in recruitment years back. If you haven't signed the T&C's they don't have a leg to stand on, as @Commander said. They might claim you agreed to the T&Cs by interviewing him in the first place and will put pressure on your from that point of view, but in reality thats all they can do...