When a USO connection is requested the first step is for BT to determine whether all available options are sub-USO - if any options (e.g. 4G) are above USO then the USO application stops there and the person requesting it will be directed to available commercial products. It may be that where an external antenna is required BT will provide that under USO.
I don't expect USO to be the answer to slow broadband that many are expecting it to be (especially of you want a connection for 4K streaming, or gaming).

3.40

b) Where this is unable to improve the service, the customer will be offered an external
antenna at the cost of £100 to help boost the quality of the connection received.
c) If it is not possible for the consumer to receive a decent broadband connection, the
consumer will be offered the consumer will be offered the opportunity to enter the
broadband USO process.

I have an external antenna. I get between 20-30 mbps (as of late) with EE, Three. I do understand that is enough. And I am happy with those speeds. I have been with various 4g providers in the past and none have offered me a reliable service.

A couple of disconnections per day
Poor latency with spikes in the 1000s
The unreliability of wireless in general.
Wifi calling over 4g is useless
The list goes on.
If you complain about poor service to a phone carrier, which I've done many times in the past. Nothing gets done. Its not like fixed line. Or maybe it does, you're just not kept in the loop. I didn't stick around long enough to find out.

Perhaps i'm putting too much faith in the USO, or asking for too much. We will see in a few months and keep you updated.

I'd also like to think the people dealing with eligibility will listen and not push a service the customer has been on for years.

Look outside and you might see a pig flying past.

Your post clearly demonstrates that you will not be eligible for support through the USO.

Based on what you've posted the USO is going to do nothing for you.

NOTE: The £100 external antenna is no cheaper than doing that already (if I recall EE pricing)

OK, everything I had understood to this point lead me to believe that the requestor would get a 4G router sent to them as the solution. If you are right anyone who can get a 4G connection is wasting their time going down the USO route.

Only times I expect to see a draw down against the USO funds is the small number delivered via fixed line.

In the vast majority of cases the USO is about having someone for public to talk to and work through the possible options, i.e. for some where 4G is not an option it may be point them at a fixed wireless service that is in their area.

USO is a safety net, to stop the moans of I cannot do online banking or pay car tax online etc

The inquirer will be offered a 4G plan (up to them to accept it, since the costs will be different to what they have now).

On the last sentence, yes if you have 4G with speeds greater than 10 Mbps down then no point in pursuing USO path, unless you are in a cluster that be viable with aggregation for FTTP. Suspect though that the FTTP is going to be focused on those outside the 4G footprint

And, boy, is a juicy one.

If reliability has no place under the USO then, well... I'm at a loss.

Suppose i'll just have to send them some Latency graphs with sporadic numbers, packet loss and time outs.

I will see that flying pig one day.

Probably worth sharing the latency graphs here first.

https://shop.ee.co.uk/broadband/4g-home-broadband the external antenna might help you, but even under the USO that is a cost option.

I will do. I'd like to hear your guys opinion on it after the fact. I already have an external antenna pointing directly at 3/EE mast. Even had it installed by a professional.