Flish

Referees in England
I've got a U15 Sevens tournament this weekend - first 7's so keen to get that under my belt, and private schools comp so should be a decent standard, however I'm confused on how 7's laws will marry up with age grade regs (this is in RFU land and schools should be following age grade regs now).
For example, in U15 age grade we have;
Any experience on how these are translated (or supposed to be translated to 7's), or do we just play straight up 7's? (I don't have the specific comp regs yet).
TIA
For example, in U15 age grade we have;
- Uncontested line out (Jump but no contest in the air)
- No more than 1.5m shove in scrum (unlikely in 7's?)
- Sh stays in the middle (again unlikely in 7's)
Any experience on how these are translated (or supposed to be translated to 7's), or do we just play straight up 7's? (I don't have the specific comp regs yet).
TIA