THE markets will have to digest a constant barrage of rumours and supposition over the future of Gordon Brown as well as the incumbent government this week, with any continued uncertainty likely to weigh on the UK markets. UK industrial and manufacturing production numbers will be watched for signs of improvement on Wednesday after the data last month showed record year-on-year declines. The FTSE 100 is being called to open down 20 points this morning at 4,418. The DAX is expected to make a modestly lower start, down 8 points at 5,069, and the CAC is looking about 7 points lower at 3,332.