30 A&K appear blocked/occupied in your seat map above.

30 D&F are not classed as exit row seats (though are bulkhead seats so have some additional legroom) so are free for you to choose as Silver, or the lower £33 amount for non-status passengers. The higher £82/93 pricing is typical pricing for World Traveller exit rows you’re seeing on 30 B/C and H/J.