The £15 was indeed paid out to people as previously stated. But as you say, it was chaos, so maybe some missed out.
I have loads of press cuttings from the time of the Llandudno floods. Dwr Cymru worked out that in the three hours that the rain fell, approx. 500,000 million gallons of rain fell over Llandudno & the surrounding area. Half of it came in my house I think. I lost my first ever teddy too.
The powers that be never declared it a disaster because they said no one had died. But if you look back at the Obituary colums over the 6/12 months after the floods and look at the addresses, you will see that people did indeed die as a result, but not actually on the day of the rainfall. Therefore, it was a disaster.
I remember the story of the looter dressed in a wet suit in the Liddell drive area. The police kept denying that looting was going on, but it was. I was myself in the back of a TA truck as the TA's were ordered out of a particular area, and remember protesting to all and sundry that we shouldn't leave the area to the looters, but I was simply told they had their orders to withdraw. It was appalling, but it wouldn't have been safe for me to stay there by myself.