Getting more wildlife into garden

Hello all,
I am trying to attract more wildlife into my garden, and have lots of birds, bees etc, plus visiting squirrels and a couple of frogs in my pond - however there is a distinct absence of hedgehogs even though I know there are some in neighbouring gardens.
The main reason for this is probably that my garden is bordered on all sides by a wooden fence with concrete base panels - so unless an animal can fly or climb it can't get into the garden! (although the frogs got in somehow!)
I have read that a 10cm hole in a fence is all that is needed for hedgehodgs to get access - however I assume this has to be at ground level, which would mean trying to punch through concrete!
On the assumption that the fence won't be replaced, an alternative may be to try and fashion a small tunnel underneath one of the concrete base panels - assuming I could do this would it be used by hedgehogs?
I am sure that other forum users must have faced a silimar problem - and I would be very grateful for any advice on what solutions you came up with...
Thanks, in advance,
Col.
Posts
is it those fence panels with concrete posts with channels?
If so , you could lift one, and the concrete base panel and make a timber panel, with hole to replace the concrete base?
Make a little ramp
you'd need a ramp on both sides, but would certainly work
IF the fence is yours then just take out one of the base panels and leave a gap. If it's your neighbours see if you can get them onside to have a hedgehog street. Have a read of this and pick up some ideas from it.
http://www.hedgehogstreet.org/pages/link-your-garden.html
I actually got a little pamphlet delivered on Saturday as a mailshot to every home in the area from a north east hedgehog charity and with a load of advice re what to do in your garden to encourage them. I binned it though because it was more aimed at urban or town gardens and we're a farm and have at least 4 pairs of hedgehogs just in the garden. Loads more on the farm. I do garden to encourage wildlife and am very successful. I've 7 bird feeding stations. 40 nest boxes. We've got masses of great birds and including barn owls, tawny owls and little owls. We also have red squirrels, otters and stoat and 3 species of bats and loads more besides.
indeed so NL2. The neighbours might be as keen to hedgehogs too
I didn't post it in bold or underscored.... can't seem to take it off either.

I'll just pretend it's so important that it needs emphasis
if in doubt, bullshit with confidence.
Northern Lass, I think you have put your finger, or thumb on the icons in the posting box .....one says B the other U underlined, just click on them again and it will go away.
Hostafan, now what would you know about bullshitting with confidence?

If you need to get cooperation from a neighbour talk up the hedgehog's love of slugs. I would love hedgehogs in the garden as a pest exterminator.