PNB Gilts is going to merge with PNB by december end. The price is 1/30th of PNB. Book value is only 1/10th of PNB. So the ratio is going to be favourable to PNB Gilts. You can buy PNB Gilts now and wait for merger within the next 2 months and get PNB shares cheaper than what you can get now.
This is strictly for long term value investors.