One of my tomato plants has a single truss with blossom end rot. Should i remove all the affected tomatoes.

You can still eat tomatoes with blossom end rot if you cut off the affected bottom part. I wouldn't remove the tomatoes as blossom end rot is not a disease but caused by irregular watering (I think it's a mineral deficiency problem) when the fruiting plant dries out and then is watered heavily. The plant can't take up the right nutrient at the right time.
You will always get better results in future growing in the greenhouse soil unless it is affected by disease as you need a good root system which can take up moisture on hot days.