You can check this https://checker.ofcom.org.uk/en-gb/broadband-coverage#
See what the max speed is showing along with any Altnets or Wholesale offerings.

Often the wholesale examples such as that of Nexfibre will show Ultrafast 10000 Mbps 10000 Mbps
However, that's more to do with it being an XGS-PON capability rather than the ISP. Neither VM or GiffGaff offer such packages. The max is 2Gbps on VM via Nexfibre.

Community Fibre is accurate and will show Ultrafast 5000 Mbps 5000 Mbps

If you are stuck only on Openreach FTTP even if you get more than 1Gbps, you will not get 1Gbps symmetrical upload due to GPON limitation.

The GPON limitation is also a reason why Openreach cannot offer much higher speeds. If the Altnet or wholesale provider offers XGS-PON only then you will not run into this limitation.

Your motherboard and Network card must also support more than 1Gbps or otherwise these packages will be useless and a waste of money. This also means good quality NVMe M.2 SSD. You also won't get 2Gbps speeds on SATA SSD, keep that in mind!!!

In reply to a post by BLaZiNgSPEED:

Your motherboard and Network card must also support more than 1Gbps or otherwise these packages will be useless and a waste of money. This also means good quality NVMe M.2 SSD. You also won't get 2Gbps speeds on SATA SSD, keep that in mind!!!

I agree with him on this.

In reply to a post by BLaZiNgSPEED:

If you are stuck only on Openreach FTTP even if you get more than 1Gbps, you will not get 1Gbps symmetrical upload due to GPON limitation.

The GPON limitation is also a reason why Openreach cannot offer much higher speeds. If the Altnet or wholesale provider offers XGS-PON only then you will not run into this limitation.

if you are in a type c bduk/project gigabit area, and you can find an isp who sells it - you can indeed get 1gbit up/down.

In reply to a post by BLaZiNgSPEED:

Your motherboard and Network card must also support more than 1Gbps or otherwise these packages will be useless and a waste of money. This also means good quality NVMe M.2 SSD. You also won't get 2Gbps speeds on SATA SSD, keep that in mind!!!

For short downloads on good hdds you can get 200mbits transfer till the buffer runs out. Anyhooooooo any reasoanble ssd be it stata or pcie based ssd will do