CK - you should get an advisor to handle the transfer for you...strange situation but I presume that they are allowed to do so under their Scheme's rules, it is quite easy to arrange such a transfer.
Con - if you take a refund the company keep's the company's contributions, you may not be able to take a refund of yours if you were in the company scheme for a certain length of time (2 years under Irish legislation, I do not know what the equivalent period under your UK scheme is).
A buy-out bond is an Irish pension - it would usually be the full 30K that you would transfer but that depends on your UK service, UK legislation and your UK scheme's rules.