You should get up to that, depending on the time of the day, BT seem to cram way too many connections together.
But Infinity 1 you should be fine due to I have only seen my Infinity 4 go down to 42Mbps just the once.
With FTTP you don't have the noise / crosstalk length of the line issues that reduce your speeds that you do with FTTC.
This is what I am currently getting:
And this is during the day and over the weekend too.
*** update ***
Added IPv6 Test Results.
Edited by PaulKirby (Sun 23-Jul-17 17:31:40)