Just got back from Lidl, an identical looking casserole, oval, 4 L (and also a round 3.8 L) both at £19-99 with Lidl app, otherwise £24-98.
So that's about £130 less than the TSV, or in other words, 13% of the QVC price.
So £130 extra just for the Le Crueset name. BTW the box was very heavy!