Quote 1:
"When it comes to labour, the price will depend on the experience of the tiler, the size of the company and your location, with prices in London tending to be higher. Ultimately, rates per square metre can vary between £20 and £40 per square metre. However, tilers can also charge by the day rate if they’ll be there for more than six hours or so, which can come to between £150 and £200 per day.
There are also additional costs, of things such as grout and adhesives, which may come to £50 depending on the size of the job, and extra costs if the walls need preparing, with either plastering or removing old tiles needing to be carried out.
Common tiling jobs:
All tiling jobs will ultimately come down to the calculations above, with a very rough price of £50 per square metre, but we can break down some of the most common tiling jobs and point out any particular issues which might affect the overall cost.
Cost of wall tiling:
The price of wall tiling can be worked out by the calculation above, assuming there are no significant issues such as the wall needing to be prepared"
Source:
https://www.mybuilder.com/pricing-guides/tiling-costs
Quote 2:
"Average cost of tiling: £35 per hour / £200 per day.
Average cost to tile a kitchen: £650"
Source:
https://www.checkatrade.com/blog/cost-guides/tiling-cost
Quote 3:
"A tiling specialist can charge an average of £150-£250 per day in labour costs depending on where in the country you are and the kind of tiling they will be undertaking.
Depending on the size of the area to be tiled, you should expect the job to take around 1 to 2 days"
Source:
https://www.priceyourjob.co.uk/internal-wall-tiles-cost/
I got three quotes. I think that you should have done so too!
£1440 is WAY over the top, in my opinion!