The U.K. Mid Caps market, like all markets, has taken a beating since the summer of last year confirming a recession (we will only hear that word in the news when it is too late). We have already seen a 15% devaluation... Can your portfolio cope with a 20% markdown? While paying fees?
16650 looks like a level where institutions are doing a lot of selling. If my broker allowed me to trade this market, I'd place an order to short the market as follows;
SL: 16815 (200 points)
TP: 15595 (1000+ points); 14845 (1800+ points). Potential rewards of 5:1 and 9:1.
or if there are any investors in the room, you could sell off your positions (hold some as cash instead) with a view to invest back into the mid cap market at 14750/14500!