No problem.

The trouble with the Postcode-only checker is that although it works reasonably well for ADSLx where total line length from the exchange is the important factor, it cannot work well for FTTC as any particular postcode can be served by multiple cabinets around it. Including of course possibly one within it.

Conversely, any particular cabinet can serve addresses in several postcodes.

For FTTC the postcode checker only reported the data for the first one it found in the database. Which might be 20 metres from the premises or the diametrically opposite side of that postcode area. With premises at tat distance being 20 metres from some other cabinet, to which they were connected.

There must have been loads of complaints, so they did the easiest thing. Stopped it reporting on FTTC etc. So for "fibre", never use it.

The list in the Address checker solves that, as I said . Always did, and to some extent still does on ADSLx. Which is why the checker itself says number is best, address is next best.

For FTTC the postcode checker only reported the data for the first one it found in the database.

This i didn't know.

That's the one I used yeah! Noise margin has dropped on the download to 10db overnight. Upload remains the same though. 😕

Went back up to 13db again before I left for work. Do you think there's a line fault? Should I contact Sky? Thanks all.

Can be a dozen different things, line fault is least likely.

Can be a neighbours (crosstalker) modem being turned on and off.
My very first crosstalker turned their modem off every night between 10-11pm and this showed as a 1.2dB jump in SNRM.
It dropped again between 7-8am when they turned the modem back on.

It could also be an appliance, like a pump/heater/generator/etc either on your premises, near it, or anywhere near the line between you and the cabinet.

Running a program like DslStats with a compatible modem to graph the snrm changes can help diagnose these things but more often than not they remain a mystery.

I'm sure you're right jOhn83. I was looking for a replacement router but will wait until after my speed upgrade I think. I check the SNR quite regularly and it's been at the same level for a long time. Only gone up this last week or so, so something has changed somewhere! Thanks.