I'm with Roz. I'm still reeling from having worked out that two nights B&B in Yorkshire (cousin's christening) will cost me approx. ?250 for a family room. Adding on the two evening meals and incidental drinks/snacks will be another ?100-150. Plus petrol ... Whole weekend will be pushing ?500. Ouch!!
Went to the Horniman last weekend - new exhibition in the bees room, plus all the old favourites - kids loved it. Completely free! Picked up buns for tea and pop at Tesco/petrol station on the way home - total cost ?4. What a fabulous resource and right on our doorstep.
Also, in a rush of blood to the wallet, we joined English Heritage last year. Quite expensive, but with a family ticket at larger attractions being approx. ?25, it pays for itself after just three "big" outings and you have a whole year of free trips to follow. In the last month or so alone, we've been to Down House (Charles Darwin's home), Eltham Palace and Upnor Castle nr. Chatham. Highly recommended!