Thanks everyone for the advice! Seems like there are a number of ways to do it.
I'm going for a hybrid of the advice given.
I have loads of gravel/stone chippings in the rest of the garden which I don't want; so I'll dig around the perimeter of where the bed will go and stick a couple of inches of gravel in it and compact it down.
I'll put a post in each corner (maybe with cement, not sure yet).
The two long sides are three sleepers long so I'll stick a post in there too.
Then screw the lot together.
Thanks everyone for the advice! Seems like there are a number of ways to do it.
I'm going for a hybrid of the advice given.
I have loads of gravel/stone chippings in the rest of the garden which I don't want; so I'll dig around the perimeter of where the bed will go and stick a couple of inches of gravel in it and compact it down.
I'll put a post in each corner (maybe with cement, not sure yet).
The two long sides are three sleepers long so I'll stick a post in there too.
Then screw the lot together.