They were possibly male plants Joy S, thats why they were bitter. After several dissapointments I now resort to buying plants from my local nursery labeled 'Fem 1'.
They are all female so no messing about, - just resist getting one just yet as the weather is still too cold, unless you have constant heat in your greenhouse,- as they are so sensitive to cold. I also protect it from nursery to green house as this can also shock it. I usually get a crop of 40+ long straight crisp cucumbers per plant. I've spent the cold, wet and windy past few days getting my cucumber plant bed ready in the green house by digging in some well rotted stable manure and giving it a good drink untill the weather warms up a bit, (then i'll race out and get it!), so the soil should be warm and not too wet. will try and get some photo's this year and post them. Good luck