What a clever idea and as you say - so simple. It''l no doubt save a lot of tears and time spent worrying.

Tis a good idea and common sense  - makes you wonder why more places don't do it???  Or perhaps parents could take it upon themselves when they go to these places to do it anyway 

I think that's a great idea Renton

PENGY - i agree

This simple idea could catch on

Why don't all parents do this when on holiday or in the city etc...

What about people who don't have mobile phones?

Hold on to your child more carefully so they dont get lost, maybe? 
Good idea tho, i know they use this system in many holiday parks. Some member of the family will have a mobile, or some contact number

Tannoy announcement Can the parents of child registration number x123 please come and collect it from the lost and found

I agree it's a good idea, but not all families would necessarily have a member with a mobile phone! 

I think the point is that the wording of the OP implies that the wristbands are an entry requirement ("visitors must write their mobile number on it"): if the parents don't have a mobile on them, the family can't get in...

I know what you mean Growly but I don't think there are many parents who haven't had that heart stopping moment when you're out and you suddenly realise that you've lost sight of a child even if for a few seconds.

It's a good idea I think - mind you, when mine were really small I was the embarrassing parent who had them on reins!

My elder grandson who's 2 and a half has a little backpack which has a 'lead' attached so his mum and dad can keep hold of him

Nothing wrong with reins. They seem to keep coming in and out of fashion: I remember seeing a lot of kids on reins after Jamie Bulger's death...

Really? 

Yes, really: and remember we're talking about the Tower of London, where a lot of the families will be foreign tourists.

As a feature, the idea sounds a good one, However if it's made an entry requirement, then that's out of order, IMO...

I think that's a bit discriminatory.  

Exactly! The last time i was there, it was mostly Americans and Japanese. They had mobiles!

The last time I went to a tourist attraction I didn't take my mobile phone with me, and Mr G doesn't use a mobile at all.  I know we're not unique in not being welded to mobile phones! 

Just had a look at the official site, and the wristbands are not a requirement:

Wristbands
Wristbands are available free of charge from our Welcome Centre on Tower Hill. Please pop in and ask a member of staff for one before you enter the Tower.  All you need to do is write down your mobile number on the band and slip onto your child.  We’ll use that number to help us reunite you as quickly as possible, should you become separated.

Well in that case, I think it's a good initiative for people who want to take advantage of it and are in a position to do so.  I think it would have been wrong if they had made this compulsory. 

I am not stuck to my mobile either, and if i didnt like the rules i simply wouldnt go to that particular sight seeing venue. Its not a big deal really. I have a 3year old Granddaughter who would give Limford Christie a run for his money, so i only take her where i know she is safe. Common sense really 

Japanese and American mobiles don't automatically work in the UK. Americans in particular often need to get a different phone if they come to the UK, as the main mobile system in the States is different to that in the UK.

Well they seem to work in Edinburgh, on the anticipation of The Festival starting , the town is full and mobiles dont seem to be a problem! 

this is similar to summer on skegness beach,  there are "zones" and children can wear a coloured wristband for that area - good idea as it gets very busy

so if some one snatches the kid, they dont have to dial 118 to get the number to get the adults to cough up the readies.

Get out of my brain!  That was very similar to what I was just about to say!

(And ellos xx)

ello karms,xx, nice to see you.