I am afraid not : the term (on nectar viking page) shows: excluding purchase of stamps, delivery charges and VAT Also someone here already mention buying gift voucher was turned down to get nectar point offer. As this offer exclude VAT, so one has to spend £60 +/- to get this offer. I also believe Viking 's price is always expensive too. So beware.
Yeah me too, awful company. https://www.hotukdeals.com/deals/60-psn-for-35-using-viking-direct-nectar-pts-deal-sainsbury-entertainment-1490128
I wouldn't bother with Stamps or Gift Cards. I took this deal a couple of years ago and bought Playstation Credit and Viking refused the nectar points.
Pretty good deal, needed a new office chair so this will do nicely. Thanks OP
Your rough calculation is wrong. 5000 Nectar points = £25