@MA038814 - it's limited by what is available from BT Wholesale/Openreach. The 900mbps Fibre product is actually provisioned on a 1000/115 service, so in reality the upstream will be a little higher than 100mbps.
The recently announced 1.6gbps Fibre product is provisioned on 1800/120, so again - a little bit more to play with there.
EE Fibre is supplied using GPON which is asymmetrical by nature. Whilst this remains the case, I wouldn't expect to see much change.
