Only if you place zero value on the convenience of sitting on a train with a good book and a sandwich rather than driving in the dark and the rain along a busy A road. And if you expect to park for free in London.
To be honest, I think £23.50 for a one-way ticket from Taunton to London on a Friday evening is a very good fare.
If you read the thread, you will see I do place a 50% premium/value on train travel, 100% for first class. Even given:
Car journey - door to door, yes I do get free parking at the end. And the passenger can read a good book and a sandwich

. Getting into London at 9/10 after rush hour has passed.
'Train' journey - drive to the train station, pay for parking or park nearby and walk with luggage, train to Paddington, walk to Bakerloo line (+luggage), top up Oyster, change for Victoria line, then a bus then a short walk (did I mention luggage?).
So no I don't think that's good value actually!
And I'm not sure who they're kidding at £180 standard open return, with what may be 10% rise in the new year.... 2 people could come up SSR and stay in the Park Lane for the night cheaper than that!!!