Thanks for all the help here!
Definitely more enrichment games are a great idea for when at home.
3/5 days my husband walks the dog when not at work at then we'll walk together at weekends so he can take the dog and I have baby in the carrier. While a dog walker may be useful, I'm also wary only because I want to practice heel walking / recall when out with him and also eventually then want to be able to let him off again to run around and release some energy.
I think the barking in the garden has developed because we used to have 3 chihuahuas next door who'd come to the fence multiple times a day and bark incessantly. Our dog then started barking back, heckles up and although we'd bring him inside straight away to "distract" him with something else, it turned into him running out and barking at them instead!
Definitely not giving up on him, just with a newborn it's increasingly frustrating. However it's good to know that it's likely the upheaval and he just wants more attention maybe. My husband gives him a lot of attention when he's at home and he doesn't seem phased by baby but it's still a lot of change for a dog (or anyone lol) to deal with.
My husband keeps saying when we get him done he'll calm down but I don't think that's really a reliable thing to count on! The vet recommended 18 months for him as a larger breed because of the impact it has on growth hormone so we're trying to wait it out as long as poss. IMO it's not acceptable for him to run over to other dogs or people to say hello and not come back when called. Although he's literally just saying hello, he's been bitten in the past by reactive dogs (this was a scenario where the owner didn't put their dogs on a lead and the dogs weren't receptive to recall etc) and I'm also aware other dogs can be anxious and not want a bigger dog to say hi.
National trust is a great idea. I didn't realise they have specific dog walks you can search. Also a dog walking field would be greet, thank you! I'll do a google.
I'd absolutely love to let him out the crate at night and ditch it at this stage but if he gets bored it's pandemonium. I'd worry we'd come downstairs to chaos in the morning. He'll eat anything and while we're hyper vigilant with making sure nothing is left on the counter or within reach, being in the kitchen he always seems to find something!! Any tips on phasing out the crate though would be amazing!! He's very happy to be in there though and will only go in if absolutely essential during the day and then at night.
If anyone has any recommendations of treats to use for practicing recall / heel too that would be amazing. We've tried higher value pigs in blankets type thing (chopped up into smaller pieces) and liver treats but no luck with either. I also tried taking chicken and cheese out with my when he was younger to practice and that didn't do much either!
Thanks so much, really appreciate the help!! :-)