At today's exchange rate, that 2.39€ is equivalent to £2.03 - on the other hand, if you do all your transactions in euros, the mostimportant factor is the proportion of your income you have to use to buy a cauliflower, so this financial nugget is probably of no relevance to your point!
French people often have choufleur au gratin, mashed with cream, garlic and parsley rather than in bigger florets cheese sauce, and in the 50s and 60s my French mother used to overcook cauliflower mercilessly until it was completely soft and breaking up. I don't know how it managed to retain its it top spot in my vegetable rankings ...