We don't know what came over LCA when they claimed in their application to Newham that jets did not use reverse thrust on landing....they had to review that in the ES supplement and admit that they did!
Here's an excellent piece of footage which requires you to have your sound on...feel the force.
How many decibels is this....by LCA's standards about 56db....by accurate measurement in the 90db range. To be fair this is one of the smaller, quieter jets compared to the BA and Swiss Air beasts.