I'm getting some very keen prices and substantial discount offer on wooden windows (U-value around 1.4) from a Polish company called Drewexim. We picked them up at Ecobuild or one of the recent shows. Anyone used them or heard of them?

Russell Timbertech - used them on 2 built projects and received quotes for another (aborted) and one just about to start. Their prices just seem to get keener and keener - latest is £253/m2 delivered for mixture of mainly 1m2 to 1.5m2 mullioned with opening light in every hole, plus a couple of large-area fixed-glass frames (so averagely 'dense'). Quality not the very highest but totally adequate, no failures or complaints. Their standard hardware unfortunately won't do the secure open-a-crack trick. Delivery has sometimes, in fact always, been late. Quotations a bit slow, not 100% clear. These are for all-timber - at the last look I wouldn't recommend their Al-faced ones, but that may have changed. These are classic Scandinavian type as adapted for 3G, not Passivhaus.