FTTP slowdown from 76Mbps to 1.87Mbps??

[#1]

Hi - I have been on FTTP since November 2014 and was very happy with the speeds of 76Mbps download and 20Mbps upload. However I felt recently that the speed was not what it should be and an Ookla speedtest today shows a speed of 1.87Mbps download and upload of 18.53Mbps, ping 12ms. What has happened to the download speed? I've tried it on 3 computers here, 2 of which are on a wired ethernet connection, with the same result. Please can you advise what I can do, or if something needs adjusting at your end?
I have also now run the BT Wholesale broadband speed test which says:
Download speed (Mbps): 2.00
Upload speed (Mbps): 18.33
Ping Latency (ms): 26.00
Further tests:
1. Best Effort Test:
-provides background information.
Download Speed
1.95 Mbps

Download speed achieved during the test was - 1.95 Mbps
For your connection, the acceptable range of speeds is 60 Mbps-76.8 Mbps .
Additional Information:
IP Profile for your line is - 76.8 Mbps
2. Upstream Test:  -provides background information.
Upload Speed
11.54 Mbps
Upload speed achieved during the test was - 11.54Mbps
Additional Information:
Upstream Rate IP profile on your line is - 20 Mbps
This test was not conclusive and further testing is required.This might be useful for your Broadband Service Provider to investigate the fault.

Many thanks!
Deb.

[#2]

This sounds like something profile-y. I'll check up and update the thread shortly.

[#3]

Thanks very much Matty, much appreciated.
Deb.

[#4]

Thanks for waiting Deb.
You ok to log into your router and hit disconnect/reconnect? I'm not really sure why your profile has changed, but I've altered it back for you now.
Matty

[#5]

Fantastic Matty, Ookla now says 74.42Mbps down and 19.07Mbps up! THANK YOU! And so quick too! 
Much appreciated. Two happy surfers again.
Deb.

[#6]

Glad to hear it