There are some fantastic lease offers on all A4 trims at the moment, I've just gone for the 2.0 TFSI S Line S Tronic for £245+VAT pm on a 6+23 6k lease (options: metallic paint and alloy upgrade). That is an awesome price for that car, having been looking at lease prices on it for the past 6+ months. The 1.4 TFSI was about £190+VAT pm on a 6+23 for the Sport and manual, it's a great deal as well but £55+VAT pm extra for the 2.0, S Line, S Tronic and options was absolutely irresistible.
One thing I will say is email / call your local Audi dealer to price match any lease offer you find online. The nice chaps at Audi Worthing price matched Fleet Prices without any hassle, and recently did so with my wife's A4 order as well. Much better to be dealing direct with Audi and cutting out the middleman.