Always found the staff at Samson at EGNT very helpful. They'll sort out a courtesy ride to the main terminal or call a taxy for you.
Wouldn't have thought a taxi into the city is £25 beer vouchers. Grandma Duchess lives just down the road and when I visit a taxy home from the city centre, even at 2 in the morning, is only about £12-14.
Landing and overnighting for a 182 a couple of years back was about £60 -not that bad in the scheme of things.
HTH