LHR Clubhouse

apparently we have access to the clubhouse at Heathrow as part of our UC service to Dubai. A few questions:
1. Flying with kids is there a dress code in the clubhouse and on jet? My two girls (15 & 10) generally like to dress quite casual.
2. Is the clubhouse used by other airlines so likely to be rammed, ours is an evening flight 22-30 - if it is then would it be best to avoid.
3. Can you still access the duty free shops?
4.are the drinks free?
5. Do we get access to a lounge in Dubai on our return Uc flight?
Thanks in advance
1. Flying with kids is there a dress code in the clubhouse and on jet? My two girls (15 & 10) generally like to dress quite casual.
2. Is the clubhouse used by other airlines so likely to be rammed, ours is an evening flight 22-30 - if it is then would it be best to avoid.
3. Can you still access the duty free shops?
4.are the drinks free?
5. Do we get access to a lounge in Dubai on our return Uc flight?
Thanks in advance