I have flown Senecas into both Glasgow and Edinburgh on a few occasions and have been asked to maintain best speed and report the speed. As long as the cloud base is at least 1000ft the Seneca can be flown maintaining 160 to 4 so I will increase speed for the approach and maintain 160 to 4. Then once inside 4dme and visual a momentary excursion above the glide slope enables the aircraft to be slowed down to lower gear and flap.