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Original windows did not have trickle vents. Company seems to be Fensa registered (according to their website). Tbh I feel terrible about not having asked for some days off work and stayed in to impersonate a project manager...
frankohara-
Also, you can check if they are Fensa registered
http://www.fensa.co.uk/asp/member_search.asp
Sumo
Did the installation get signed off by building control or is the company Fensa/Certass registered?