McDonnell Douglas and Hawker tried to get the MOD to buy new-build AV-8B's and AV-8A+ aircraft and then again BAe and Boeing tried to sell the AV-8C and AV-8C+ but each time they were denied. I know there was at least one attempt by the DoD to offer retired AV-8C+ aircraft to the MOD for refurbishment to keep the Harrier fleet viable until the F-35 goes into service, but they were rebuffed again. Now it looks like the entire Harrier fleet in the US will simply be scrapped upon retirement because we can't even get the French and Indians to buy them.
but there is something to be said for making our own version purely to retain the skill and capability base.
I've often heard that argument, but I can only assume we never actually had the skill and capability base as we don't even appear to be able to licence build someone else's aircraft without it costing an arm and a leg and you don't even need the design skills to do that.
True, of course the problem these days is we order so few of anything that the development costs can't be spread out enough so the headline cost per unit looks insane compared to an off the shelf buy. I'd hate to think how much it'd cost to convert three new air frames such as A340s to do the Rivet Joint role.
We do have the capability and the capacity is still available (but only just) - the problem is, as always, ensuring that the use of capability and capacity is ultimately profitable (even if underwritten by the MoD). The cost of design, rigs, tooling, training etc is huge and that's before a rivet is jointed (so to speak). Our problem has always been that we have not produced anything in continuing sufficient volume to warrant the cost of the infrastructure required to build. Add that to a lack of commitment or imagination for new UK designed large airframes and you have a dead or dying aircraft industry.
BAe Systems Regional Aircraft would still be producing RJs today if only the world wanted more of them.