On the MG website the:
MG ZS EV model D (the cheapest) is 949,000
MG ZS 100th Anniversary Model (the cheapest) is 659,900, with 4 year 100,000km warranty & (it looks like) free service
So, the breakeven point to offset the 289,100 EV upcharge using grid is about 135,000km, or if using MG SuperCharger 165,000km.