using the bt checker it lists adsl2+ as available also adsl2+annex m
They are services from the exchange, not the cabinet .
ADSL from the cabinet would remove the line length between the exchange and the cabinet from the broadband service. However, because of interoperability constraints, there are limits on what can be done using ADSL from the cabinet if that service was available for ISPs to order.
It's a little misleading to say that the chance (of faster broadband) has been removed from you and your neighbours. Unfortunately all forms of DSL have distance limits. The performance of VDSL2 starts out much faster than ADSL2+, but falls away faster as line length increases. 1.4 miles is almost certainly too long for VDSL2 to offer any advantage over ADSL2+ from the exchange - indeed, it might not work at all.
The available subsidy money was never enough to offer faster service to all. FTTP would be a possible solution for you, but the expense is going to be difficult to justify for a small number of properties a long distance from the cabinet.
I do know the area around Walcott, as I'm in Stalham several times a year. There's a reasonable concentration of properties in Walcott, but as soon as you move away from that area, properties are thinly spread.
Hopefully some solution comes along in the future that allows you to take advantage of the fibre running as far as the cabinet.