Do you live in a terrace or older property, with the need for and earth rod?
Which charger are you having, Pro or e-Pod?
EVSE cable is around £8.50-£9 retail which is the price you will have plus a percentage ontop for them supplying.
Did they state why you needed a delay board?
£464 seem’s OTT to me considering Motability are paying for standard install which includes the charger.