That area is a commercial rollout area, so you need to expect holes in their network, your area is/was part of the 2011 - 2012 FTTP Commercial Project, going by the NGA Doc for 2011 they was down as phase 7b, so not long after my are that was 5b.
This is there info.
Postcode: SY1 3EU
EO Flag: No
% Lines: 100%
FTTC or FTTP: FTTP
You really need to keep asking their ISP and pester them due to your postcode on that PCP Cabinet should get FTTP, well according to the NGA Docs.
This is where commercial areas are being shafted, now if it was a BDUK area that was down for FTTP all that postcode would most likely get it.
If its anything like my postcode/area you will probably find out its not finished yet, try getting your local MP involved.
Normally the entire postcode gets the FTTP, I have seen BT rollout FTTP on just 1 line on a different PCP cabinet so that they complete the whole post code.
Can anyone else on your phone pole get FTTP?
TBH I would email Openreaches Fibre enquires team on firstname.lastname@example.org
Give them your Full Address along with your landline phone number and say that you was down for FTTP back early mid 2014 and that you would like to know when your going to be able to order FTTP.
Be polite to them in your email.
BTW what's the door number, you can PM it to me if you don't want to say it here.