Old photo of Gaywood Road ?

Hi,
I found this old photo which I think is Gaywood Road Kings Lynn. Anyone know what might be going on here ? I can make out the sign which says Class 2 so maybe a school group ?..the post box outfit is great.

Please help.

I didn't find the right solution from the Internet.

References:
www.kingslynn-forums.co.uk/viewtopic.php?f=14&t=7761
healthcare system marketing

Thanks