Allotments 4 All

Does anyone know the best places to buy these (I don't know the proper name).   This year my glass roofed potting shed has just not been warm enough. 

hi florald, try this link, http://www.garden4less.co.uk/heated-propagators.asp

hope this helps :D

Thank you very much for the link. They don't sell what I had in mind but they have warming pads which would do the job I think.  Have to check with OH re strength of electric supply in my potting shed.