Sir – I have just returned from three days in John Radcliffe Hospital, and I want to express my appreciation and thanks for the wonderful service I received there from all the doctors, nurses and other staff.

I went in (starting in A&E) with a slow heartbeat and it was soon found that I needed a pacemaker which was expertly fitted (cardiac unit).

I am now back to normal.

At a time when there is too much criticism of the NHS, I want to express my gratitude for this wonderful service.

Michael Havinden, Oxford