I have the old Airfix Farmhouse (built and based) and I think I have a 'spare' in the back of the loft as well...but I'd have to check! The Airfix model was pretty good, and with some embellishments is still perfectly presentable: But this Sarissa model looks quite superb. It's a touch more expensive than the Airfix one though.
Interestingly, in researching the battle of Ramillies (1706) recently I have come to realise that farm buildings in that part of Belgium did not change greatly between the early 1700s and early 1800s - meaning that in fact parts of La Haye Sainte (and indeed the whole thing) are perfectly useable for the War of Spanish Succession in Flanders as well.
Yes i too used to have the Airfix version when I was a kid. All sorts of armys fought over that farm back then!!
This is indeed the version Italeri released in their Waterloo set. I bought it beginning of last year, along with the barn and stables. The main set only came with the farmhouse and frontage (and a few sprues from Italeri's Napoleonic range), so the barn and stables had to be purchased seperately. I think the main box was somthing like £65, the Barn £30 and the stables around £25.
Now the whole farm can be bought for £75 (and without Italeri's "wonderful" Napoleonic offerings!), so still pricey, but it is a high quality representation in laser cut MDF.