I have a windows surface pro 3 from work, it is on a domain and all firewall and security settings are locked up but otherwise I have full admin rights.

I upgraded windows 8.1 to windows 10 Novemberish and all went fine, however I have noticed over the past few weeks when on my home network browsing is slow as anything, I haven't had the chance to check it on my work network since mid December (I'm a teacher going back to work in a couple of weeks).  I think I have narrowed the browsing issue to the down to the upload.

Going through speedtest download 56.25 Mbps upload times out, dropbox uploads at 2-3 kbps onedrive simply fails.

I would put this down to wifi as my desktop gets this 



however my android phone gets similar results to my desktop 32 down 26 up

Surface pro 3 is running windows 10 latest updates wifi right next to the router
The router is a fitzbox
ISP 2 degrees VDSL

I would take it to IT but unless I tell them what needs to be fixed they will go through the "have you tried restarting the computer/router/internet ... then they will blame it on my internet configuration.

What tests/settings can I check to narrow down the issue?

Cheers