The King has been forced to cancel a string of engagements after being admitted to hospital today over his ongoing cancer treatment.

The monarch, 76, was tonight back at Clarence House ‘working away as usual’, with sources describing it as a ‘most minor bump in a road that’s very much heading in the right direction’.

However in order to ‘protect and prioritise [his] continued very positive recovery’ he has ‘regretfully’ cancelled a string of engagements in Birmingham tomorrow.

Sources insisted there was ‘no drama’ and described the ‘brief’ trip to hospital this evening as being ‘connected to [his] treatment programme’.

But it is a concerning reminder that more than a year after announcing he had been diagnosed with an undisclosed form of cancer, that the king is still undergoing treatment while undertaking a busy diary of public engagements.