Hi HUC.
I highly recommend the Boots Wrist Blood Pressure Monitor (normal price £39.99). It's easy to use and tells you your blood pressure/pulse rate and if your heartbeat is irregular or normal. I bought one and have found it to be very accurate. Have a look on the Boots website - Enter 'monitor wrist' in the search box and it should be the first one on the page. It's now priced at £36 ready for Black Friday.
This recommendation is from my own personal use of the product - I don't have any financial interest in Boots whatsoever.
Money well spent IMO.
Enjoy your weekend.
Paul