Visa help - flight home 181 days after issue

Can anyone assist? We'd like to have a late week or so in October and have found flights that take us back home from Dalaman on 14th October. Our visa was issued on 16th April this year, so that takes us 1 day over the 180 days. Are we able to pay another tenner on the way in for another or is that a no-no? Is the 180 really strict? On both our passports you can't see 16th on the entry visas but clearly see 23rd on the way out of Dalaman - could we argue we came for less than a week in April and only arrived on 18th? Or does 1 day over really not matter that much?
Or should I just look for different flights....
Or should I just look for different flights....
