The retailer is attempting to revive flagging general merchandise sales, which span clothing and homewares, with a star-studded advertising campaign featuring Dame Helen Mirren and Olympic gold medal-winning boxer Nicola Adams.
But analysts believe the campaign will have little impact on sales in the July to September quarter, while the mild autumn could also dent trading, as on average they predict a fall of 1.5% for like-for-like general merchandise sales.
Car parts and bicycle business Halfords should report its fifth quarter of retail sales growth in a row on Thursday as Britain's renewed interest in cycling shows no sign of abating.The group is set to follow an impressive first quarter, when retail sales leapt 8.8%.
Supermarket Morrisons is set to reveal further sales pressure in its third quarter as its turnaround makes slow progress in luring in hard-pressed shoppers.
Retail analysts expect the fourth biggest grocery chain to report another quarter of declining like-for-like sales, down as much as 1.8% after a 1.4% slump in its first three months, according to Santander expert Tim Attenborough.
Insurance giant Aviva is likely to reveal the impact of the St Jude's storm on its finances when it updates on recent trading on Thursday.
The hot summer weather helped budget retain chain Primark overcome chillier conditions in the spring that had led to subdued sales growth, with the retailer expecting full-year like-for-like revenues expected to rise by close to 5%.