How do you change exactly? In the last 15 years we have had one of the wettest summers on record (2012) and one of the driest summers on record (2018). We have had one of the coldest starts to Spring on record (2013) a year after one of the warmest (2012). We have had months of persistent below average rainfall (2010-early 2012), followed by the wettest April to June on record (2012), and persistent dull cloudy weather (August 2017-April 2018). We had the coldest December for 100 years in 2010, and one of the mildest asnd wettest in 2015. It is becoming a distinct possibility that the above are a manifestation of a changing climate, and that the UK is losing some of its variable climate, and experiencing more blocked weather patterns with persistant weather types for weeks, or even months (linked to Arctic sea ice loss and weakening of the jet stream). It is difficult to see how you can grow things that can cope with all the extremes of our climate, since crops that tolerate drought will probably suffer in soaking wet conditions, and crops that like heat will probably be killed in a late spring cold spell. I think the answer is to try and manage the microclimate around your crops, so fleecing in unusual cold, have good drainage in the soil in preparation for wet spells, grow crops sensitive to bolting in the shade of taller crops during the middle of the day, and accept that if we get significant deviations from the norm, some losses or poor harvests are inevitable, and be grateful you are not a subsistence farmer and can go get food from the supermarket if you suffer a crop failure.