Apart from joining the campaign (see the "Support us" button) you could do these things ...

Whenever the noise from an aircraft upsets you, complain to the Airport using our form here: here.  We will forward the complaints we receive each month to the airport BUT there is no guarantee they will look at them

You can also use the Airport's own, more complicated complaints facility here - you will need to scroll down the page to find the complaints link. The Airport will look at complaints submitted this way.
If you have more than one holiday abroad in a year or you go on city or weekend breaks each year, maybe think about not flying on all of them.  In the UK, roughly 50% of the population does not participate in air travel in any given year, with 15% of the population responsible for 70% of all flights - the frequent fliers. Is this you?
Train travel is a more rewarding alternative to flying which reduces our contribution to climate change and brings us closer to the countries we visit.  Maybe travel comfortably & affordably by train or ferry, rediscovering the pleasure, romance & adventure of the journey.

The Man in Seat 61  

RailEurope will book tickets for you from UK stations to destinations in Europe via multiple rail service providers it partners with.

RailBookers will book travel and holiday packages for you: 

And there's always The Trainline for planning journeys by train
It doesn't have to be forever, but maybe just don't fly on holiday this year.  Have a look at this website, sign the pledge!  Go flight free!
For example:
  • Flying economy from London to Paris generates 27 times the CO₂ emissions of making the same journey by Eurostar (53 kg compared with 2 kg for a one-way trip)
Have a look at this web page