Ciao Alberto,
I've been in the UK for 2 months... and I'm gonig to stay here quite long.
Yes, I will sit the Nagel Anomaloscope with City Uni In London (well, they do the complete colour vision test).
CAA normally (for the UK) gets 3-4 days + postal service for letters, certificates and whatelse... this means normally 4-5 days...
For Italy (oh, dear, how I miss my country...) 3-4 days + int'l postal service (4-5 days?)... so could be easily 9-10 days after their verdict about your test...
wish the best!