Are the new security checks now here for good

[blingo]

To do it, you have to do it airport style, what is being done is not effective or secure enough.

[alfie]

What exactly are they looking for in the search and what do they do if they do find something that would or could create a serious safety problem?

you really have to ask? try weapons pyros, explosives for starters

So what would they or could they do if they found any, blow a whistle?

I would suggest it's more of a deterrent, knowing you will be searched might put people off trying to bring stuff in, and I'm sure they know what actions to take if something suspicious is found.