Can I give you some advice on the situation with getting the kids to sleep, and believe me I do this for a living so I know however harsh it sounds it needs to be doing.
They need to learn to get themselves to sleep, not have Mummy lying there with them, and as its Mum they are used to having get them off to sleep, then you are the perfect one to be able to do this.
When its bedtime, spend the half hour before bed doing something relaxing or quiet, not winding them up so theyre hyper when they need to sleep. Maybe sit there reading a book, make sure your wife is downstairs with her feet up so they cant see her.
Then you say "its time to go to bed now" and you tuck them in and leave (maybe get a nightlight so they arent on their own in the dark) and when they start crying try your very hardest to ignore it. They know that crying gets them what they want, hence why they do it.
If they get out of bed, pick them up, tell them its bedtime and calmly put them back. You might have to do this a lot of times, and there will be tears, but eventually they will get the hint and go to bed. It might take a week or two of crying, but like I said they need to learn to get themselves to sleep and at the moment your wife is just taking the easy way out by lying in bed with them but not really solving the problem. And the reason ive said for you to do it, is partly so she gets a rest (dont let her come up and help!) and also because they associate bedtime with her, and therefore if they see her, they will think they are getting a cuddle to sleep again.
Please dont take this as an attack on either of you, but as I said I do this for a living and kids are crafty little devils. Eventually it means they will just go to bed, with no fuss and you and the wife get your evenings together.
Thats good advice, we pretty much tried the same thing in the past, we leave the landing light on so its not dark in thier bedroom. Problem is when we ignore them they get out of bed and come shouting at the top of the stairs, if we ignore them then they come downstairs. Weve tried taking the TV out of the room all sorts but they just grind us down. Instead of relaxing kez just gets worked up and ends up either venting at me or the kids

Looks like its all irrellevant anyhow because shes rung this morning and shes not coming home today, shes on about having a week ot two away at her mums so she isnt coming home yet at all

Just dont know what to do now, i feel very deflated. I hate being in this house alone and worse thing is today was meant to be shopping day so im going have to go hungry as well
