River Height History - Last 30 readings

Date & Time Height
2018-02-21 04:30:00 1.186
2018-02-21 04:15:00 1.185
2018-02-21 04:00:00 1.183
2018-02-21 03:45:00 1.184
2018-02-21 03:30:00 1.186
2018-02-21 03:15:00 1.186
2018-02-21 03:00:00 1.185
2018-02-21 02:45:00 1.186
2018-02-21 02:30:00 1.187
2018-02-21 02:15:00 1.190
2018-02-21 02:00:00 1.187
2018-02-21 01:45:00 1.187
2018-02-21 01:30:00 1.186
2018-02-21 01:15:00 1.187
2018-02-21 01:00:00 1.188
2018-02-21 00:45:00 1.189
2018-02-21 00:30:00 1.187
2018-02-21 00:15:00 1.190
2018-02-21 00:00:00 1.190
2018-02-20 23:45:00 1.188
2018-02-20 23:30:00 1.190
2018-02-20 23:15:00 1.191
2018-02-20 23:00:00 1.191
2018-02-20 22:45:00 1.189
2018-02-20 22:30:00 1.190
2018-02-20 22:15:00 1.191
2018-02-20 22:00:00 1.190
2018-02-20 21:45:00 1.191
2018-02-20 21:30:00 1.191
2018-02-20 21:15:00 1.192

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