Quill,
I'd have to investigate it further.
But I believe they will take you back at the end of the LWOP.
If however, things turn pear shaped & you want to come back earlier ie: after 6 months of a 3 year LWOP. They are under no obligation to take you back until the 3 years have elapsed & you can't seek a redundancy payout at that earlier time.
So if it doesnt work out, your effectively shut out for the three years.