Decent Laminate/vinyl click Underlay...

I've got a customer who lives in a 2nd floor flat with a big open plan, LVT was her choice but now she's swaying toward a rigid click or decent laminate but has asked me to quote for a decent sound proof (ish) underlay.

Any recommendations?

The couple under her cool alot and can sometimes smell their cooking but she's more concerned about dampening out some of their noise.
Obviously we know without the proper 'sound proof method' she will struggle but just wanted to see what you guys use as a decent underlay...?

 

Could go Regupol 5mm mate then Timbermate excel

 

Cheers for that Daz, ill look into that route then.

 

There are a few versions of Regupol out there. Sound sense is one of em.

 

We use the wakol accoustic matting. Same as regupol basically. Stick it down