It seems that whenever I want to print in colour, my ink-jet cartridges have dried out.  On this occasion, so had the spare set.  Perhaps I should store them somewhere cooler.  The printer and spare cartridges had been given to me by my Dad when he bought a new printer, so I have not previously needed ink-jet cartridges.  My existing printer is a mono laser.  A quick Google found Internet-Ink.co.uk.  I ordered two Epson compatible T007 and two compatible T008 cartridges for the princely sum of £9.96 including VAT and delivery.  The order was placed on Thursday evening, an email confirming dispatch was received on Friday afternoon and the postman pushed the package into my letterbox on Saturday morning.  Excellent service all round.