They won't be digging up the public footway in response to an individual order.
Although I'm sure that's normally true, I forgot that I have experienced a counter-example.
I had FTTPoD installed three years ago, which put a CBT in the footway box right outside my property. As a side effect, two of my neighbours became FTTP-enabled in the checker. The next ones either side hadn't, and I didn't check any further.
However, it turns out that strangely, a neighbour 3 doors away had also been marked as FTTP enabled. I don't know why - perhaps it was a mistake, or perhaps their copper is served from a DP in my footway box. When the people living there renewed their contract with Vodafone, VF told them they could have full fibre, and so they ordered it.
When Openreach came out to install it, they found that there was no duct from my footway box to the one outside their property.
Rather than simply reject the order (on the grounds that their database was wrong), they actually came back, surveyed it, and a few weeks later dug up the pavement between my house and theirs to lay a brand new duct.
I think it was really a case of following what the computer said, rather than questioning it.
But it goes to show: you *can* end up with a dug-up footway just from placing an order. The neighbour effectively got FTTPoD for free