Well, I'm blowed! I thought I was a rarity. Thanks for your replies, folks.
Ken, I have not got an adjustment to control smudgeability (new word?), but the machine is set for the appropriate paper.
Ian, like most of us, I use my inkjet for mailshots, invoices, etcetera when smudging (Ah, that's the word!) is not a likely problem. I am mainly concerned about using the post office "Smart Stamp" service, which would mean having a printed label on envelopes being delivered in all weathers.
SMP Steve, Thanks, I will get a colour laser. Konica-Minolta do one for about £200.