Please visit https://adslreports.merula.net/dslchecker.php 

enter phone number or post code

enter post code

select address and click check 

select address

on the next screen it will show you the service availability i.e. adsl or fibre (FTTC should be enabled)

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If FTTC is enabled i.e. customer has fibre available at the searched post code.

adsl