Hold onto the certificate until they decide which platform they will be using to trade on. Make sure your broker allows trading on that platform before sending the certificate in.
NR is the only one to benefit from the continual dilution long term shareholders have and will receive. The share price reached a peak of around 1.1p back in 2014 (22p equivalent after consolidation).
What value is realistically expected to be achieved should a sale of assets happen and more importantly is this likely to be soon? Will the value spent over the years even cover what could be expected from any sale?
Even 20p is 1p old money would expect and hope a value in excess of 1p otherwise would barely repay all the costs spent to date. Directors only ones to benefit every year at expense of long term holders