River Height History - Last 30 readings

Date & Time Height
2018-10-20 04:30:00 1.018
2018-10-20 04:15:00 1.019
2018-10-20 04:00:00 1.020
2018-10-20 03:45:00 1.021
2018-10-20 03:30:00 1.023
2018-10-20 03:15:00 1.025
2018-10-20 03:00:00 1.026
2018-10-20 02:45:00 1.027
2018-10-20 02:30:00 1.030
2018-10-20 02:15:00 1.030
2018-10-20 02:00:00 1.031
2018-10-20 01:45:00 1.033
2018-10-20 01:30:00 1.034
2018-10-20 01:15:00 1.035
2018-10-20 01:00:00 1.037
2018-10-20 00:45:00 1.038
2018-10-20 00:30:00 1.039
2018-10-20 00:15:00 1.041
2018-10-20 00:00:00 1.042
2018-10-19 23:45:00 1.044
2018-10-19 23:30:00 1.045
2018-10-19 23:15:00 1.047
2018-10-19 23:00:00 1.047
2018-10-19 22:45:00 1.048
2018-10-19 22:30:00 1.051
2018-10-19 22:15:00 1.053
2018-10-19 22:00:00 1.052
2018-10-19 21:45:00 1.054
2018-10-19 21:30:00 1.055
2018-10-19 21:15:00 1.057

If you want to change the amount of entries returned then change the limit value on the url
If you want to search by dates then use a url like this:-
http://www.little-barn-cottage.co.uk/river/API_raw.php?stationReference=1990TH&from=2017-01-01&to=2017-01-10