Don't panic you wont be alone probably over 40 of you. I did this holiday in November and there was 45 on it (think thats maximum) but only 5 of us posted on the forum beforehand.
Probably better posting about a month before your trip.
I'm off to Mallorca in April and posted to see if anyone else is going, got no replies yet it is fully booked up.
You could ask Olly (Ask the Editor), he will tell you how many are booked and how many from Gatwick.
Mick