Impossible to answer, AO - the 'bit' from the JBox to house is only a small part of the equation. The rest of the line is relevant too - patched/aluminium/drowned - who knows? I suspect you will never know. They may even have swapped your line to a 'better one' at the exchange.
Do they still pull new wires through to solve problems?
- it depends how you are 'wired' - if like many round here your grotty wires are just buried in the earth there is nothing to 'pull them through'.
Oldbeefer - a common story, and several 'winners' have found that (as predicted) houses on opposing sides of the street have different results due to 'cabinets and lines' and delays. It was simply a
PR stunt and I'm actually glad my village went from No1 at the start to 'off scale' at the end. Your village is now, of course, sadly, 'out' of the running for BDUK money to improve things since you are 'NGA Black' (or 'grey').