After watching London tonight last week it made me think about how easy it is to get the signal for my key so I brought
Mengshen Car Key Fob Signal Blocking Pouch/Bag/Case, Car Anti-theft Guard Protector
And am I right to say that if I put my key in this should the signal be blocked and can’t use it when I am next to it?

Yes.... it stops the car key communicating with the car when it’s looking for a response... so you place the key in the bag at night or if you are going to be away from the car. You will need to remove it from the bag to be able to open the car and start it.

That is what I was thinking so if I was to put the key in it and walk up to the car with the bag it should not be able to open the car?
Because I have done this and it open the key so was thinking the bag does not work.......

I have my keys in a metal tin but after watching that programme I took the tin out to the car and if the tin was at window level the car unlocked so I've been looking at buying one of these bags but if that's the same then what's the answer ? 2019 4.4 SDV8 Autobiography Velocity blue.
2017 SVR. SVO Scafell grey Ebony interior. Gone
2012 3.0 SDV6 Autobiography santorini black with ebony/cirrus interior. Gone

I have a faraday case that I keep both keys in & ive stood next to the car with the case & both keys & it wouldn't open so I know mine def works.What sort of case have you got,the one I got came from a recommendation off this forum & came from amazon.

Andy Andy.
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The bags have two pockets which are not obvious...open the bag fully and place the keys in the rear most pocket between the faraday lining...
I suspect you are placing the key in the front pocket which is not protected...you put your key in this one when in your pocket when you are driving..at night you put it in the rear pocket to stop baddies code grabbing...

I got my one off eBay and have tried both pockets thinking it might make a different but does not so take it I brought a door ledge instead then lol.

Farmer Chalk wrote:

The bags have two pockets which are not obvious...open the bag fully and place the keys in the rear most pocket between the faraday lining...
I suspect you are placing the key in the front pocket which is not protected...you put your key in this one when in your pocket when you are driving..at night you put it in the rear pocket to stop baddies code grabbing...

Will have to try it again later and maybe film it or the pouch I have is rubbish lol

I only know this from finding out the hard way myself...it’s really not obvious but you need to slide the key between the sheets!