Yes there are 3 here:
Chubb WS1 (pricey), Bramah Rola R1/06 (less so) and ERA 822 (cheapie)
Note that the ERA is the only one to come in pairs (the only way to fit
them) so the others are actually up to 4x the cost. I also prefer the style of
the ERA as you don't have to drill such a large hole in the sash but the
others have the benefit that the locking post sinks into the window rather
than being removed. You can get these and DIY sheds too.
Note also that all of these are IMHO better than this one:
http://www.mightonproducts.com/catalog/index.php?cPath=3 which I feel
is more susceptible to force attack. The locking piece is larger on the
previous, they come with a striker plate for the other sash and the tabbed
style of the body resists twisting out under force.
You did mean _sliding_ sashes didn't you . . .
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