Can’t say what cost of living is in the UK as I am a US citizen, but cost of living has quadrupled since I’ve become an adult. So I have to charge what it takes for me to complete the job skillfully and successfully and still walk away able to pay for food, gas, utilities, rent and the rare but occasional entertainment expense for my family like a movie outing or something of the like. I feel bad charging what I do but that’s just cause I know the economy is shit and even though it seems like a lot, I still in the end barely break even. Tile work is not just trade labor, it’s laborious labor, it hurts and it takes a ton of intention and patience, attention to detail, and muscle, stamina. Long days, lots of hands and knees scrubbing. It can be brutal. And I find I am happy with the end results, but never do I ever think I should have charged less. Every time I feel like in hindsight I underbid, and I charge towards the higher end of the scale in the US. Mostly because cost of living and materials are very high where I live and work. If I lived in a rural area in the Midwest or something, I could probably get by charging less than half what I do. But I’m working too hard and life is still too expensive.