By Josie Cox 

U.K. markets rallied Friday as Prime Minister David Cameron's Conservative Party looked on track to win the U.K. election with a slim parliamentary majority after drawing far stronger support than expected.

The British pound rose 1.2% to $1.544, according to CQG. Earlier it reached $1.5521, a level last seen in late February, from $1.5243 before exit polls late Thursday.

London's FTSE 100--the benchmark equity index of the country's largest companies--surged 1.8%, spurring gains on the pan-European index.

Shares in banks, utilities and construction companies got a big boost. Economists said that some of the policies of the main opposition Labour Party had been perceived as potentially negative for those sectors.

Shares in Royal Bank of Scotland Group PLC, Lloyds Banking Group PLC and Barclays PLC were all trading between 4% and 6% higher by late morning, while utility Centrica PLC was up nearly 8%, making it one of the biggest gainers on the index.

U.K. government bonds, or gilts, also rallied, with the yield on the 10-year falling around 0.10 percentage point to 1.83%. Yields fall as bond prices rise.

The Conservatives' strong showing was a far cry from the dead heat predicted in months of pre-election surveys, which could have spelled weeks of uncertainty around the country's political future.

In fact, Mr. Cameron's expected majority gives him the right to govern without a coalition partner.

"This result is far less complicated than the markets' worst fears," said Bill O'Neill, head of the U.K. investment office at UBS Wealth Management, which has $668 billion in assets under management.

"With certainty will come a renewed confidence from investors in a more stable and transparent policy climate."

Simon Gergel, chief investment officer for U.K. equities at Allianz Global Investors, said that this outcome is therefore good news for the markets.

"Instead of Fallout Friday, today could turn into Frenzied Friday," he said.

The FTSE 100 and the FTSE 250 index of midcap companies--traditionally more exposed to the domestic economy and therefore particularly vulnerable to political jitters--were resilient in the lead-up to the vote.

So far this year, the FTSE 100 is 6.5% higher. The FTSE 250 is up 11.5% in 2015, thanks to a near 3% gain Friday.

Rob Jones, co-head of European equities at UBP, said the outcome was encouraging him to look for buying opportunities in the U.K. stock market.

"The result makes it more likely the U.K. will sustain levels of economic growth and should provide some boost to overall consumer sentiment," he said.

Still, some strategists and investors cautioned that a government led by Mr. Cameron could hurt markets in the longer term because of his pledge to hold a referendum on whether Britain should stay in the European Union.

Phyllis Papadavid, senior global currency strategist at BNP Paribas, said that the "referendum risk" would "haunt the currency at a later stage."

Invesco Perpetual veteran Neil Woodford, head of investment at Woodford Investment Management, also struck a more cautious tone.

"A less conclusive result would clearly have been worse for the economy because of the associated political uncertainty, but our assessment of the U.K. economy suggests we should expect modest growth at best over the next few years," he wrote in a note.

"[The election] certainly doesn't remove all of the political uncertainty," he said.

Write to Josie Cox at josie.cox@wsj.com

Access Investor Kit for Lloyds Banking Group Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=GB0008706128

Access Investor Kit for Barclays Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=GB0031348658

Access Investor Kit for Centrica Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=GB00B033F229

Access Investor Kit for Royal Bank of Scotland Group Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=GB00B7T77214

Access Investor Kit for Barclays Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US06738E2046

Access Investor Kit for Centrica Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US15639K3005

Access Investor Kit for Lloyds Banking Group Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US5394391099

Access Investor Kit for Royal Bank of Scotland Group Plc

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US7800976893

Royal Bank of Scotland (NYSE:RBS)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Royal Bank of Scotland Charts.
Royal Bank of Scotland (NYSE:RBS)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Royal Bank of Scotland Charts.