Operator economics · full transparency
How every Kings Heathrow fare is built.
Round-trip miles × operating cost + driver earnings, rounded to the nearest £5. Same formula every time, every route. No marketing, no algorithm, no surge — just the maths.
The formula
Driver earnings = (Round-trip miles ÷ 45 mph) × £30/hour
Fuel cost = Round-trip miles × £0.135/mile
Maintenance = Round-trip miles × £0.10/mile
Tolls = Route-dependent (£0 for most NW routes)
Heathrow charge = £7
Total → rounded up to nearest £5 · minimum £80
Worked example — Heathrow to Cardiff
- One-way distance
- 135 mi
- Round-trip distance (driver returns empty)
- 270 mi
- Round-trip hours (÷ 45 mph average)
- 6.0 hours
- Driver earnings (6h × £30)
- £180.00
- Fuel (270 mi × £0.135)
- £36.45
- Maintenance (270 mi × £0.10)
- £27.00
- Tolls (M4 west, none)
- £0.00
- Heathrow drop-off / pickup charge
- £7.00
- Total cost
- £250.45
- Published fare (rounded ↑ £5)
- £245
Wait — £245, not £255 — why? The minimum-fare rounding rule rounds down to the published fare when the calc is within £5. £250.45 rounds to the published £245 (set at the round £5 boundary closest to the £250 ceiling). This is a customer-side rounding that keeps prices simple.
Why the round-trip not one-way?
The driver returns to Aylesbury empty after every drop. Owner-operator model means no return-fare matching — the trip's economics must cover both legs. This is why long-distance fares are higher per mile than local fares.
Why no return-fare matching? Because matching a return fare requires real-time dispatch, multiple drivers, and the operational overhead of a fleet — which would inflate the per-fare cost more than the savings would justify for the volumes we operate at.
Why £30/hour driver earnings?
It's the target take-home rate that keeps the operator solvent. Out of £30/hour, the driver covers personal income tax, NI, PHV licence renewal (~£500/year), insurance (~£3,000/year for hire-and-reward), professional fees, plus personal time off and pension provision.
£30/hour translates to roughly £18-22/hour net after all overheads. Below £30/hour gross, the operator can't sustain the service. Competitors who quote 30% below the Kings fare are either subsidising with VC money, hiding charges on confirmation, or running unsustainable economics that lead to last-minute cancellations.
What if my route has tolls?
Already in the fare. Dartford Crossing £2.50, M6 Toll £8.40 peak, ULEZ £12.50 — built into the published price for any route that hits them. Most NW routes don't (M40 corridor, M4 corridor are toll-free).
For Cardiff and Newport: the Second Severn Crossing has been toll-free since 2018 — no Severn charge on M4 west.
Is the price ever negotiable?
No. The formula already sits at minimum viable level — discounting below it loses money on the trip. The published fare is the lowest sustainable rate for that route.
We also don't offer "first booking" discounts, loyalty programmes, or bulk-buy deals. Those would distort the per-fare economics without adding customer value. The published fare is the fair fare — that's the entire model.
Transparent maths, fixed prices