Lastminute.com is offering dinner and theatre for just £20. As an example you can get Sound of Music tickets, plus a meal at Indian restaurant Imli, for £20 per person. The tickets alone are worth £35, so this is a terrific deal.
To book, go to Lastminute and browse the show packages on offer.
The shows available:
Sound of Music
Joseph and the Amazing Techicolor Dreamcoat
And several others
You do not have a choice of restaurants, it is dictated depending on the show you are seeing, but all seem reasonable quality.
One of the restaurants mentioned is Pizza Express and this can easily cost £15 per head usually.
Most are available till end of February.