Yeah. The 31st and 52nd FG came to England in 1942 as P-39 units, but since the Cobra was unsuitable for long-range fighter sweeps and bomber escort (both requiring high-altitude performance) which were required in the ETO, and since their planes had not yet been shipped to them anyway, they converted to Spitfires (remember that even during the Battle of Britain the RAF had a lack of pilots, not planes).
Which actually was quite sensible, since the 4th FG, the former "Eagle Squadrons" that had been transferred to USAAF after Pearl Harbor, was already flying Spits as well, and the VIII Fighter Command of the 8th AF at the time pretty much consisted of those three Groups only.
After the decision to go ahead with the Torch, the newly-established 12th AF then commandeered much of the US fighter strength in the UK, including two of the three Spitfire-equipped Groups. Again, it made sense since the RAF already operated Spits in the MTO and "tropical gear" was readily available for the VB.