Thank You all for your replies.
Since my post, we have found EMA's work experience application form aswell as asked a couple of local flying clubs regarding a placement. My son has already had 2 trial flights at Leicester so maybe doing his placement there could be a great idea. We have also contacted Servisair and Signature Flight Support aswell as interacted with SafeSkys regarding a placement. My son is starting to realise he may have to look at different routes for his placement as it appears he was fortunate to get half a day in ATC last year.
A family friend works at Monarch and they told us that sometimes you can get a placement if you know somebody there, but my son is clinging onto the fact he could work airside with the planes or be involved with ATC somehow.
Thanks Again.