Callsigns...
... are a legal requirement for a radio licence.

Good radio procedure is a good habit to get into, because while it may sound a bit silly when you're just talking about tours leaving it will seriously improve your communications when you're dealing with an emergency.

The last thing you want when you're trying to evacuate a building full of random public when it's on fire is this sort of thing:

"Hey Sharon, can you hear me?"
"Who is it? Is that you? Who is it?"
<protracted silence as someone sits on their microphone, jamming all the radios>
"Can you hear me?"
"Yeah, can you hear me?"
"No, can you hear me?"

We get this shit all the time.
(gordonjcp, Tue 29 Jan 2013, 9:15, 2 replies)

Unlikely to be radios requiring a licence
Most walkie-talkie users are not radio amateurs or anything like that, which is why the drones in places like Go Outdoors and similar sprawling stores are issued with hand held radios.
( Snappyuk gets BIGGER with free sample., Tue 29 Jan 2013, 11:37, closed)

If they're in the UK...
... they either need a licence, or they can use the cheapy crappy £12.99-in-Argos PMR446 gear.

Just about all the National Trust stuff uses licensed radios. If the OP tells me which NT site it is, I'll look them up and tell you.
(gordonjcp, Tue 29 Jan 2013, 15:21, closed)

Very true
although the differing voice procedure between organisations can be confusing - personally, I'd have ripped the piss out of the OP's reported "over and out"...
( wynoh kills threads by his mere presence, Thu 31 Jan 2013, 18:02, closed)