Blood samples to assess HO-1 expression in circulating monocytes will be taken prior to the administration of the study drug, and at 24 hours post dose. Samples for routine blood tests including full blood count (FBC), urea and electrolytes (U&E), C-reactive protein (CRP), liver function tests (LFT), and ferritin will be taken alongside those for monocyte isolation, with a further set on day 7. Serum (and urine) will be frozen for batch analysis and monocytes will be isolated by in-house protocols. Routine blood tests will be processed at the biochemistry and haematology laboratories at the RIE as per their usual methods.