New Fibre Installation - What speed should I expect?

[#1]

Can I join in on this?
My IP Profile is 77.44 but my speeds have fallen from 72 initially to 45 now.
Done all the usual tests, master socket, router change etc
Simon

[#2]

got my fibre install on tuesday
estimated speeds are 80/20
First thing I did was buy some external grade cat5e and 2 x face plates as I dont want my homeplug 500's interfering with performance

[#3]

@Simon - speeds do seem to fall a bit when first installed - mine went from 73Mb to around 68Mb
Sometimes it is worth logging on to the Router, doing a manual disconnect then turning off the BT Modem for a few minutes, turn back on the BT Modem, wait a few minutes then turn back on the router and see if it is any better. Mine usually syncs a few Mb higher when I do this after it has been online for a month or so.