Both of the two main politcal parties, which are different shades of the same political niche, have no real commitment to reduce fuel duty. Therefore, we cannot infleunce future pricing through electoral pressure, which could be 2 yrs away anyway.
In the presence of a critical mass of people disenfranchised from politics, our "democratic" governments can hike taxes to fund whatever operations they wish: illegal wars, surveillance, ID cards, and "defense" (often offensive) projects which delivery late and overspend etc
As referred to elsewhere, protest alone cannot change policy but left unhindered, our successive governments will become more powerful and the tax burden will escalate to new levels. The unrelenting attack on the wallets of motorists is set to continue.