Depends entirely on what you do, where you live and what your personal circumstances are.
Brain surgeon with 5 children living in central London, clearly not enough.
Single person still living at home with their parents in a cheaper part of the UK, at the start of a career - plenty of money.
On an hourly rate it's £14.18 per hour compared to the current minimum wage of £10.42 (going up to £11.44 in April). .
Excluding any pension contribution that should give you a monthly net income of just under £1,800.
We have some entry level admin staff in our office who are on the lowest payscale and we pay them £15.50 an hour, so would be £28k for the same amount of hours.
That said, at my age and work life experience, I would not say £25,800 is a good wage. Sorry OP!