CGT on sale of Enterprise Zone building

A partnership bought an EZ building in the 80's and obtained 100% allowances.  The partnership still exists but does nothing more than hold the building.  The original trade was transferred to a limited company.  Now that 25 years have passed the partners want to dispose of the building.  Am I right in thinking that no allowances can be clawed back and the full cost is allowable for CGT despite the fact that tax relief has already been obtained against the profits of the partnership?  The partners are also considering transferring part of the building to their spouses prior to the sale.  Is there any reason why they should not do this? Are there any specific anti avoidance rules?  I was not thinking about tax in the 80's and would appreciate any advice!

Many thanks

WL