£400 is cheap!!!
i would get that in writting or budget for a few £££ more, cost me nearly £700 with a 3 piece clutch,DMF,rear crank seal and the exhaust that got fooked up from dropping the subframe and exhaust falling apart lol
And if youre getting this done, get the crank seal replace like i did, it'll cost about £5 and save you taking half the car apart when it starts to weep and fook up the new clutch.