Talk

I'm not sure I could forgive this, why would he do this Costa is hardly an emergency and surely he could take him with him. Anything could happen. There is some NSPCC guidance I think will see if I can post a link

A nearly eight year old should be OK for 15 minutes, but I wouldn't lock them in.

I wouldn't leave someone else's child home alone if their parents objected though.

No no just no

www.gov.uk/law-on-leaving-your-child-home-alone

Was your DS scared?

I don't think this is ok and even less ok is lying about it. This basically means you can't trust him and he will go against your parenting wishes if you are not there. This would be a dealbreaker for me because I would never be able to trust him with my children.

Tell him to buy a bloody coffee machine.

The locking in is so much not ok.
Why on earth would anyone leave a child if they couldn't get out in an emergency?

Why not just take him? Odd.

Thanks. DS wasn't scared (he watching a Pokemon video) but it just doesn't feel right to me.

Yanbu, especially locked in!
(I leave a sensible and well-briefed 9yo for 15min but only if I'm walking; I always think if I'm driving there's too much potential for an accident /breakdown that would delay me.)
He should damn well take him to Costa with him if he's so desperate for a coffee.

Eight is alright to be left for a little bit, if ds is alright with and crucially so are both parents. A lone child locked in the house with no escape in the event of an emergency is much less alright.

I think he thought he was safer locking him in as nobody could just walk in. When i raised my concerns first time I got a 'he was just watching TV, nothing is going to happen'. But then he agreed not to do it again.......

I think the bigger problem is that he clearly didn't agree but rather than talking it through with you he just thought he'd do it again and not tell you. I'd be worried about what other judgements/ decisions he might make when you are not there...

Why didn't he take him with him or make himself a coffee at home?

The fact that he was locked in and wouldn't know how to get out in an emergency makes it unsafe rather than his age as such.

The risk of someone walking in is far smaller than the risk of an accident/fire and your DS being locked in and no-one being able to get him out.

Sensible child age 7 left for 15 mins absolutely fine, just say not to lock him in again and should be fine.

Terrible
And just why?!

How odd

If your dh doesn't like instant coffee then ds should be taken to costa or he could buy a small coffee machine for at home ( probably working out cheaper than Costa in the long run)

Locking the child in, with no idea where a key was.

I also think 7 is too young to know how to react if a fire or similar happened

How do you know it's 15 minutes?

He'd be fine. He should know how to get out, though.

Whether or not he would be fine is irrelevant . The op has a right to decide at what age her child should be left and should be able to trust her partner to adhere to her wishes. In these cases the parent who is more cautious should usually get the deciding vote (i.e. if i wanted my children to walk to school on their own but DH said he wasn't sure they are ready yet it would be unreasonable of me to let them walk on their own and just not tell my DH)

Why would he go get a Costa coffee. Do you not have a kettle?

Can't imagine leaving dd1 home alone for 15 minutes.