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Multi mode Fibre only tends to get used these days for Short runs for private networks.
Anything going in in the way of telecoms from BT at least will be single mode
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Multimode fibre is used over shorter distances and you can also get more data down it because of the larger core. Most Urban CCTV systems will probably utilise Multimode or internal office networks.
Standard Single Mode G.652 fibre is the one used most and with standard equipment you can usually run around 100km before repeating.
If you use raman amps you can easily get 230km before repeating.
If you use special fibre such as non-zero dispersion shifted single mode, you don't get any further but you can use more of the light spectrum within the fibre for WDM & DWDM systems.
If they were to utilise fibre to the home, for BT, I would expect they would have to use Single mode. Unless they built a new network topology specifically for it.