If there is FTTC in the area, you could check if FTTPoD is available and pay the install charges to get the work done. The monthly prices are cheaper than a leased line but it may cost more to provision than a leased line. I know that cerberus networks and Fluid One offer this.
You could also apply for a community funded solution with Openreach who will draw up the excess charges. Once the build is complete you have a choice to go with any FTTP provider rather than select one with FTTPoD. https://www.openreach.com/fibre-broadband/community-...
It might also be worth getting bonded VDSL which again would be cheaper than a leased line. Cerberus offer this aswell.
To add: FTTP on Demand will usually work out cheaper over time but that time period depends on the initial cost which could be as low as a few thousand pounds or up to £40K, which is decided by how hard or easy your install will be. Allow at least 12 months for installation and the first 12 months after that you will be on a 30 Meg upload (300/30 product), although all your jitter issues will be gone.
After 12 months you can switch to different speeds and/or supplier. You could I suspect buy out the first 12 months of that initial contract (~£1440) and move to a faster product straight away, but all adding to the costs.
Given the aim is to have most people connected up to FTTP in the years to come you might find a leased line until such time FTTP arrives at your home for free may work out overall cheaper, and certainly would be delivered quicker. I think with leased lines you need to sign a 3-year contract; the gamble of course is FTTP might turn up in 12-18 months, or it might not turn up for 10 years. Without knowing the future, it is all a gamble.