Well yes, a full IR would be lovely (especially as many people say that IMC holders should never actually use the rating on purpose; only when they've blundered into cloud by mistake), but these days it is well beyond the reach of most recreational pilots in the UK both in terms of the cost and the amount of time that has to be devoted to the ground school and exams.
If I do decide to go for an IR in future it will be the FAA one. It's a shame we don't have something equally accessible on this side of the Atlantic.