Seems very shortsighted to me.
It could be that the re-arrangement of the copper makes for enough properties to make one PCP viable, where two separate PCPs would have been left out.
Do you know what cabinet no. the BT Wholsale DSL checker used to say for your line, compared to now? The cabinet should be in the top line of the result.
Usually, I'd point you at http://www.dslchecker.bt.com/
to check phone number.
However, that won't work with a TalkTalk LLU number, so I'll point you at this address checker instead: http://www.dslchecker.bt.com/adsl/ADSLChecker.address
Don't use the postcode checker (it gives bad results), but you can put just the postcode into the address checker, then it gives you a list of addresses to select from.
Also, do you know what number cabinet was painted on the removed cabinet? Perhaps it is visible on an old picture from Google streetview.