On a note of (possible) historic interest:
Back in April 2012, Sky Fibre initially launched as a "40/2" product. A few weeks later, it was then upgraded to be a "40/10" product. I think this all happened because BT Retail revamped the Infinity product line (around the same time as, if not actually the day before, Sky Fibre launched) to introduce "40/10" and "80/20" products.