My DD (14) has done both BYMT and NYMT. I think most people have covered the NYMT answers so I will try and answer for BYMT.
BYMT have one Easter Production and the rest of their productions take place through the summer holidays At audition you can opt out of consideration for a place in the he Easter Production if the dates don't work for you.
You only have one Audition workshop with BYMT - there is no recall stage.
BYMT operates a reserve list system for production offers. After all auditions at all locations have taken place first stage offers will be made. These all go out on the same day and if successful you will be offered a place in a production not a specific role. Casting will take place as part of the rehearsal process.
If you don't get offered a production in the first round of offers you will be placed on a reserve list. The date offers are made varies year by year but as a rough guide expect first stage offers late February and for the reserve list to remain open until late April.
All BYMT courses are residential. They stage productions in various UK regional theatres which will be announced at the same time as the 2026 season. As an indication The Lowry Manchester, Exeter Northcott and Southwark Playhouse were all used in '24 and '25. Accommodation is typically in a boarding school commutable from the Theatre.
You do not need to audition to take part in a BYMT musical workshop or skills course - usually referred to as "camps" in BYMT speak. Again camps are always residential and are held at various locations across the UK.
Camps are typically1 week long and Productions take place over 2 consecutive weeks
Hope this answers most BYMT audition questions but if I've missed anything let me know :)