I know some locations where you could order 50 lines and none of them would be via a cabinet as there ain't any cabinets nearby, sadly there is no certain answer to this question as every location is different.
Edit: When I say 'cabinets nearby' I actually mean that could be used to provide service.
Thanks for the information. Its a family member in North London. The exchange is Canonbury which is 950m away. The problem is that they are in a development of approx 20 houses (all on EO) surrounded by FTTC on all sides. The nearest cabinet is about 200m away.
Looked at CFP but expensive and no grants or vouchers.
By odd coincidence, my London place is on Canonbury Park North and is EO. The nearest FTTC cabinet is outside the Canonbury Tavern, only 350m away but yeah not served by it.
The only options are woefully slow ADSL, Virgin or...dare I say it leased line. So that's what I'm getting on with.