just been down to wilkos, found that they do a selection of mini greenhouse covers, if like me you have over recent years brought the 3 tier mini greenhouse from instore/poundstretcher then find after one season the plastic disintergrates, then because you can't get a cover you relent and buy another one and again the plastic breaksdown, i have been using the frames as staging but today found that if you have two frames take the angle tubes off the top of one and take a section from your second frame you will now have a 4 tier greenhouse frame. wilkos do a 4 tier heavy duty cover for around £5.95 and it fits perfectly, so hopefully this will last for years,hope this might help someone out there, assemble the frame first because the tubes can be difficult to seperate if pushed home too hard, so if the plastic breaks you havent wasted a journey to wilkos,seeya mick
