Please would you post here who you are intending to send it to?
Multiple identical letters to politicians are frequently seen as ‘vexatious’ and don’t get proper replies. We need a dialogue to be established about TTIP. A letter sent from ‘we the undersigned’ with lots of signatures has a much more powerful impact.
If I can maintain a list of where it’s already gone we can avoid multiple copies.
Having said that any additional general letters simply saying you’re worried about the effects of the TTIP on the NHS, fracking, health and safety regs, employment rights, etc wouldn’t come amiss as a way of building up the pressure!