Whitlock - Organ Symphony in G min - Francis Jackson - Amphion label - recorded in York Minster 1999
Basil Harwood - Organ Concerto in D - Adrian Partington is recording the entire Organ works of Harwood - Vol. 1 at Bristol Cathedral, Vol 2 at Birmingham Oratory, Vol. 3 at Clifton College - on the Priory label - however the Organ Concerto seems not to have been recorded yet!
CH Lloyd Organ Concerto - I can find no reference to a recording of this work anywhere. Sorry!
Hope that's a bit of help!