No compensation for an entire day lost at the airport waiting for late baggage

In July I took a Swiss Air flight to London via Zurich. Both flights were with Swiss Air so I assumed the allocated layover would be sufficient. In the end the connecting flight was on the other side of Zurich Airport and I got on at the last minute. Only when I landed in London did I discover that my bag had not made it onto the flight. The next flight was delayed by over an hour, so I faced 4+ hours in the baggage area with no access to food or anything besides water. I was told I could exit the baggage area and then return through security when the bag arrived on the next plane. In reality, the bag was supposedly only available about 5 hours later and it took a further 3 hours or more to get back into the baggage area to collect it. So I was at Heathrow for over 8 hours waiting for my bag. (I chose not to get the bag delivered to a destination because I was travelling onward and there was a high chance it would not arrive in time). I had to change my train ticket twice, incurring significant costs to do so. When I approached Swiss Air for a refund for the food, drink and train ticket change costs. they refused to refund anything. They also refused to compensate me for the entire day spent waiting for my bag.

On the basis of this, I cannot recommend flying Swiss Air: they take no responsibility for their own failures and refuse to provide even the most basic compensation to passengers.