Bag drop questions

Hi

can anyone advise on how long before departure time the bag drop opens? If it is airport specific I am flying from East Mids.

Also, if we are a party of 3 travelling with 1 hold bag, do all 3 of us have to be present at the bag drop desk, or is it just the person who has the bag against their name on the booking (so essentially could OH and daughter go through to departures whilst I am dropping off the bag)?

Thanks

Firstly the info is in the emails you receive after you book your flight, if you had read them:
AIRPORT SELF SERVICE KIOSK AND BAG DROP DEADLINES:
All Airport Self Service Kiosks and Bag Drop desks open 2 hours prior to the scheduled flight departure time and close strictly 40 minutes prior to the scheduled flight departure time.

If you wish only one person can queue up with the bag. But it must be the person the bag belongs to.

cheers - obviously wouldn;t have asked first question if i had access to my email account at the time, but the confirmation of the second part has been really useful