When to mow daffs and bluebells in lawn

Hi everyone
I'm after some help with my mowing please. I've got various bulbs growing through my lawn and I'm never sure when it's 'safe' to mow them so that they'll still come back next year. I'm not so worried about my snowdrops and crocuses as they're pretty much done for by the time I get into a regular cutting routine. However, the daffodils and bluebells hang around a lot longer into the cutting season. How brown do the leaves and seed heads need to be before I can give them the chop please? I've attached a few photos. Thank you

 

It normally takes 6-8 weeks for them to die down after flowering, the leaves go completely brown and can be pulled away without much pressure. In our lawn we just mow around them if we have to mow but we don't mind longer grass.