Appreciate this has been asked a thousand times but would like some advice specific to my situation. Most of my work is outside. Landscaping, pergola builds, but also interior decorating, kitchens, bathrooms etc for the colder months. I have no electrical qualifications at all and my knowledge is limited. Typically at the moment I might be building a patio and installing lighting in the slabs as I go. Armoured cable, waterproof gel-filled junction boxes etc. I might also be adding spike lights and spotlights around the garden. Installing the switches etc. My current set-up is that I do 90% of the install then while it’s still exposed my electrician will check and test, then run power outside if needed and commission it. I’ve no desire to not use my electrician but would like to be able to do more myself and more importantly would like to be able to test and fault-find if necessary. Be able to calculate loads as well would be useful. I’d also like to know that if a very minor fault occurred (replacing a duff fitting or switch say) that I could do so safely and legally without paying him for a days work or more importantly having to wait until he’s available. Is there a short course that could be recommended that would give me the above? I don’t want to go on a 5 or 10 day course to find out it teaches me even less than I already know. I’ve been looking at the various domestic installer courses. Even though these probably don’t cover exterior and bathroom / kitchen work, but if they cover enough of the fault-finding and basic theory then they may still be what I need to improve my knowledge as well as covering me for removing sockets and switches when doing decorating work inside. Many thanks in advance for the advice.