I find the comments about gardeners and insurance laughable and they show how naiive and ignorant the general public are towards certain professions.
My PL insurance is around £280 just now. £5M cover. I am often up ladders on pavements using dangerous petrol machinery (trimmers and chainsaws). How does that not present a risk to the public? Strimming kicks out stones at very high speed - fast enough to embed a stone in someone's leg, smash any window or car windscreen or cause severe physical damage if it hit someone's face. Insurance for this trade is more important than any of your office-based jobs as it's not simply there as a financial obligation.
Start up costs for the trade? How much would a reliable van, 3-4 different mowers (average cost £500-2000 each for professional machines), chainsaws, trimmers, platform ladders, strimmers (all in the region of £400-800 each item) and a plethora of ancilliaries cost? Stockpiles of lawn feed, sand, compost, salt... premises to keep the equipment safe, full set of company clothing, PPE... there is no definitive list but it just goes on and on. I use 40 litres of weed killer a year and that costs about £300.
You CAN start this type of business on a tiny budget - work for someone with a big country house and their own tools. The wage will be low but you can slowly build it up from there. Most people in my shoes earn agood wage after business expenses are taken out as we are efficient, we have large commercial contracts and the right tools to get a lot done in a day.
Then again, you do get the unreliable retired boys charging £6 an hour. Choose who you want to be and have a firm plan.
Did I mention trade and H&S accreditations as required by clients, formal training to enable the user to use chainsaws (IRO £1000 training) and spray pesticides (IRO £400)?