Lydia is no substitute for Lisa Dingle.
She's been forced upon us.
As we are getting lots of improbable scripts let us now discover Craig had recently changed his Will and left everything to Lydia.
She decides she can't bear to stick around and gives some of her inheritance to Sam and Samson and then buggers off to start a new life on her own somewhere.
Right, that's that sorted, now let's sort out how to get rid of Victoria and Nate next.
Maybe he will go away when he finds out about Tracey.
Sadly I think we are stuck with Victoria because she's a legacy character but maybe she could relapse into her childhood trauma and only talk to a ventriloquist dummy again.