Raised beds - hard for frogs, hedgehogs and slow worms to patrol?

Hello,

I would like to convert all my allotment beds into raised beds, but I worry I will create a barrier for helpful predators.

My allotment plot is in London, with slugs and snails decimating young seedlings in the Spring.

I already have slow worms in my compost heap, and I've seen what I believe is their skin on my beds, so I've stopped using slug pellets.

In the long term i plan to install ponds and hedgehog houses to get all these guys to patrol my plot so I won't need pellets.

...But, how can I help them access the raised beds without taking up valuable room with ramps etc...

Any ideas would be much appreciated! Thanks.

At the moment I'm considering raised beds with missing portions eg. [ ]

Could you put ramps on the ends, instead of along the sides/paths?

I'm impressed at how well toads can get up on things - I don't know how they do it.  We even had one on our front porch because he wanted to sit under the air conditioner overflow water drip - our porch is about three feet off the ground.  But I don't know how well hedgehogs can climb or jump.  You might be able to make double-duty structures by putting small piles of rocks at the ends of the beds, so folks can either hide under the rocks or climb them to get into the beds.

Possibly an epic jump from the toad? how big are these toads?

With the beds running east-west, i want to keep the bordering edges closed so the grass from the communal paths (running north-south) does not invade and is easily strimmed.

This would make each bed a long dead end. Do you think this would reduce throughput of the predators?

Maybe hedgehogs could climb copper mesh nailed to the sides of the bed but not snails and slugs.

Frogs toads and slow worms will be fine , hedge hogs not so much depends how high your raised bed are.

David