Your estate is quite new, it doesn't show on the google satelitte image but does show on street map with a 2011 image date. This means that the Cab may have had only a few customers on when the planning was done and therefore didn't meet the loading required to put an FTTC cab in place at that time..
The estate looks that it may even be big enough to have needed a new cabinet so BT are likely to revisit it in a later phase. As the public info 'most' people are looking at is a year out of date, if there is a new cab this will not be shown on the visible records. If we are lucky a ISP rep with more up to date info may be able to confirm that the whole postcode is still on cab 74 or whether there is a new cab as well.
Use the E-mail address firstname.lastname@example.org
contact Openreach, remember to give a full description of the estate age, and additional house quantities, etc so that the person who deals knows they need to look at updating the records, otherwise you will get a response based on the original records when the planning was done 12-18 months ago.
Openreach often revisit areas after the original exchange activation to do additional cabinets, this is especially true in a big exchange area like Bridgend where there are too many cabs to do all in one go. So you are likely to get Fibre eventually. There may be a wait if the estate has a 'no dig' embargo for the first year after the council adopts it, you will have to contact the council if this turns out to be the case!