Hi Deeps
Yes we also had a problem with that top fixing to the side wall coming loose but,as you say, as it seems not to be fixed to anything inside the side wall I was less shocked with this. At the first service AV at Tebay had a play with this but I suspect it will work loose again.
I was more shocked with the other as it is attached to the solid cooker/sink unit and the other bottom one that hadn't come out was still firmly fixed in to the metal piece that holds it. Why would the front one fall right out?.MikeT