The OEU mounted a Maverick underneath a Tornado and got it talking on the weapons databus. That was as far as Mav on Tornado got, it was never flown.
For current ops the DMS Brimstone is more useful as the target discrimination capability of a modern laser designator pod is far greater than the relatively poor resolution of the IR or TV seeker on the UK variants of Maverick. Also, there is a man-in-the-loop all the way to impact with DMSB, which is quite important in the stringent ROE environment of today's limited conflicts (for example, if a school bus full of nuns [imams?] drove very close to Terry Taliban's truck whilst a Mav was inbound, it would be quite possible for the Mav to transfer its tracking onto the wrong vehicle, and there would be nothing the pilot could do about it
). DMSB has a small warhead and at times the 'punch' of an AGM-65 would be useful; however at other times it would be a handicap. I stand ready to be corrected, but I believe that the GR7/9 force only ever loaded Maverick in HERRICK when they had a heads-up of a possible moving target (which would have been tricky to engage with the other weapons available to the Harrier force at the time).
Because of the ROE issues, Laser Maverick (AGM-65E) would have been the most useful variant, but that was never procured by the UK. It was a US Navy variant that had gone out of production several years ago; I believe the USAF did investigate restarting the production line, but I have no idea whether it has actually been fielded in recent years.
As ever, flexibility is key, so in an ideal world you'd be able to carry both DMS and Maverick! However it costs so much to integrate and flight trial weapons these days that we make do with what we've got...
I don't think Sniper will be added to Tornado or Typhoon. It is a technological dead-end; there is nothing more that can be squeezed from it, and we only have a relatively small number of them. Litening, on the other hand, has bags of development room; new sensor heads and reconnaissance add-ons are being developed, all remaining within the same pod shape and size (avoiding the dreaded cost of the flight carriage trial).
As has been alluded to on other current threads, weapon integration on Typhoon is even less straightforward than on Tornado. They are far more interested in getting Storm Shadow, Paveway IV and a recce pod onto Typhoon so that they can retire the Tornado fleet. This is going to take quite long enough already without introducing the added cost and time required to make use of a small, relatively un-useful stock of TV and IR Mav...