2 BIG AND SMALL upper circle tix to TRADE for 1 upper circle for another date and pmt for 2nd ticket -

I have 2 tickets for BIG AND SMALL with cate blanchett for Friday 27 April. They are upper circle, Row A, a bit off-center. £25 each actual value. We are unable to go on that date. I would like to trade these tickets with someone for either - 2 tickets of equal quality for another date or - 1 ticket of equal quality for another date + cash payment of £25 to reimburse me for the second ticket Please email me asap.