41(R) Squadron is currently the Test and Evaluation Squadron for Tornado GR4 and Typhoon. Test pilots for those types are posted to 41(R) after finishing their test pilot school course. Also, some test pilots who have returned to front line squadrons after a tp tour may be posted back to undertake a further tp tour on 41.
Test pilots have certainly been posted back to front line units and become flight and squadron commanders as part of their career progression.
Hope this helps.