Tipping it down with rain this afternoon, potting up some plants, ran out of pots. Went into town to get some more at Homebase, got the pots then spotted two louvre window openers marked down, were £11.29, then £9.99, now £4.99.
Bought both.
Excellent bargain !!
The openers were either "returns" (been opened), or had been opened in store. One had the small bag of screws and washers missing, but I didn't need them as the originals on the louvre window were the same. Fitted one and it works a treat, the other will have to wait until I get a louvre window fitting for the other greenhouse.