AIBU to let kids walk home from school

[mrsglowglow]

They are Y6 and Y5. To allow them to walk home together and let themselves in with a key and wait for me to get home. They should be home by 3.40 and I should then get home by 4pm. It's a one off and they are both keen but I've got nagging doubts. The alternative would be to get them to walk to grandparents house and wait there for me. It's a slightly longer walk for them and they both say they'd rather walk straight home. They are starting to gain independence but have never walked home on their own before or let themselves in to an empty house. I'm thinking I need to first let them walk home alone when I'll be here to let them in and get used to that first or am I being neurotic?

[TheNoodlesIncident]

Chasing, I'm intrigued, what time do your dc finish school in the afternoon?

My Ds is in Y3 and they're let out at 3:35...

[Chasingsquirrels]

Primary is 8.45 - 3pm. It's about a 6/7 minute walk.
Secondary 8.45 - 3.05pm. Ds1 gets the bus which drops off up the road at 3.25pm.