The rule for side income: if the hustle takes more than two weekends to start paying, and the pay is under £15/hour, you're better off asking for overtime. Here are the ones that clear the bar.

1. Tutoring

£25–45/hour, entirely legal, demand exceeds supply every September and April. GCSE maths and English are the bread and butter. A-level physics, chemistry, and biology are the premium rate.

  • Platforms: MyTutor, Tutorful, Superprof take a commission (10–20%).
  • Direct clients pay the full rate. Word-of-mouth is faster than platform reviews.
  • You don't need a teaching qualification. You need to have been a good student yourself, recently, in the subject you're teaching.

2. Research and transcription

£15–25/hour for English-language academic transcription, user research, and data labelling. The quiet good employers:

  • Respondent.io — pays £30–150 for hour-long user interviews in your field.
  • User Interviews — same idea, US-heavy, pays in dollars.
  • Prolific — academic studies, £9–12/hour on average. Tedious but reliable.

The trick with all three: fill out your profile in forensic detail. Studies target specific demographics; a thin profile gets no invites.

3. Dog walking and pet sitting

Rover and Tailster match walkers with owners. London rates run £12–18 per 30-minute walk; two dogs at once is the arbitrage. Overnight house-sits pay £30–50/night, often in flats nicer than yours, with a dog who is pleased you exist.

A quiet advantage: it is the only side hustle on this list where the working conditions are strictly better than the main job.

4. Selling clothes you already own

Vinted for fast turnover, Depop for anything mildly vintage, eBay for everything else. The failure mode is listing items at what you hope they're worth; the success mode is listing at what they actually sell for (sort by "sold" on eBay to find it).

A bin-bag of clothes you haven't worn in a year is genuinely £80–300 on Vinted, over the course of two or three months. It is also a satisfying way to discover that your wardrobe is smaller than you thought.

The one that rarely works: drop-shipping

Every TikTok finance influencer is selling a drop-shipping course. The course is the business. The underlying drop-shipping business has margins of 5–15%, a customer acquisition cost you can't win without ad spend, and a customer service burden you didn't budget for. Nearly everyone who tries it makes less than the living wage per hour, if anything. The exceptions are loud, which is why you hear about them.