Looks like you have a pH issue that is locking out micronutrients.
Check and adjust the water you use to wate ryour plants based on the results of the test.
For example, if the test shows your soil is 7.5, your next watering should be with a solution that is about 6.0.
In the meantime, you may foliar feed your plants with a complete fert that has micronutes in it. I see you are in the UK; I believe that you will be able to find a product called Algoflash, whcih is a micronutrient supplement that I like to use as a foliar feed for deficient plants.
stinkyattic Reviewed by stinkyattic on . Newbie- 1st post -advice with Nute burn / fert deficiency? Extensive Pics Inc. Here are the details: # Had been using a regular fert all the way through to budding at NPK 6:3:12 # Moved on to using Bio Bloom at 2:6:3.5 when it started to flower, as some leaves started yellowing. This was about 2 weeks ago. #Leaves have continued to yellow - help!! I have stopped all ferts for the past week, and have been using plain tap water for about 3 - 4 waterings. #The soil has not been over watered, as the leaves are not droopy, and I usually let the soil go nearly dry Rating: 5