... hm... my next home purchase might just have to have a conditional clause that if I can't get broadband, the deal is off...
You know, like how you can back out once you get an appraisal and learn that there are termites.
That's right. It's called a "contingency" - it's a rider on the contract. All contingencies must be addressed to close escrow.
Disclosure of all facts (such as no broadband available) must be clearly stated by the seller or else there are grounds for a lawsuit, should an unhappy buyer care to waste even more time and money in court.