Broker tips: BP, Lloyds, BHP Billiton, Weir Group, Bwin.party

"This change is likely to put severe pressure on the integrated oils, leaving them too high on the cost curve." As such, Goldman reckons that dividends are likely to come under "severe pressure".

Lloyds is now rated as a 'sell' by Investec, which sees downside for the stock following its recent outperformance.

The broker said the stock has "enjoyed a euphoric reaction" to its first-quarter update on 1 May and the result of the UK general election, taking its shares to a fresh 6.5-year high. It said that the share price is now more than up with events.

Analysts at Credit Suisse moved to trim their price target on BHP Billiton from 1,400p to 1,350p following the spin-off of its South 32 unit, keeping an 'underperform' rating.

The analysts said that BHP’s valuation “looks full” when compared with its peers. Its shares change hands at 9.5 times cash-earnings, instead of 6.7 across the rest of the sector.

Shares in UK-listed industrial engineer Weir Group were advancing after analysts at Citigroup lifted their rating on the stock from 'neutral' to 'buy' and hiked their target price from 1,750p to 2,200p.

The bank said that the risk-reward balance on earnings upgrades at Weir is "now tilted to the upside in our view".

Exane BNP Paribas has upgraded Bwin.Party to 'neutral' from 'underperform' saying that if a deal place takes with 888, it would be a clear positive for Bwin.

“The growth outlook is challenging and Bwin faces taxation headwinds in regulated countries. However, we upgrade the stock to neutral as the company could be taken over soon,” said Exane..dpuf