Purchasing 8pcs 6S 10Ah 10C capable LiPo batteries from:
https://hobbyking.com/en_us/multistar-high-capacity-6s-10000mah-multi-rotor-lipo-pack.html £34.33 - each + whatever it takes on postage. £274.64 + postage
It would give us 1776Wh pack (e-bike batteries are usually about 400-500Wh) Immediate available power - 17 760kW.
We have electric motor capable of 4kW or so:
We would need a ESC to power 3-phase motors, or DC motors from mobility scooters (about £20 from charity shops).