The Prime Minister has tweeted ahead of a day of remembrance a decade after the London July 7th bombings.
David Cameron tweeted to say that: "the threat continues to be as real as it is deadly – but we will never be cowed by terrorism."
Some of the "Big Six" energy firms have responded to the competition authority's findings that they have been overcharging customers for years.
British Gas, Eon and SSE all said they will look into the findings, with British Gas admitting it has "questions and concerns" about some of the Competition and Markets Authority's proposals to make it easier for customers to switch.
The competition authority has suggested that energy giants take advantage of "confusing" bills that make customers less likely to look into switching suppliers.
It has found that millions of customers are overpaying by around £60 a year.
Mayor of London Boris Johnson says the 7/7 killers "failed in their aim", but warned that the problem has not "gone away."
Speaking in Hyde Park ahead of a memorial service, he said the terrorists "didn't in any way change the fundamentals of London and what makes this city great", adding: "Indeed, it's gone from strength to strength in the 10 years since.
"I think most people would say that London has become even more cosmopolitan, even more welcoming."
But Mr Johnson said people must remember that "the problem has not gone away", adding: "We're as ready as we think we can be, and as you can imagine there are preparations going on all the time in the event of all kinds of attacks."
Millions of households have been paying too much for energy, a year-long investigation by the competition authority has found.
The big six suppliers have been overcharging customers by around £1.2 billion a year - the equivalent of 5% - or £60 - per household.
The Competition and Markets Authority found:
- Around 70% of households were on default standard variable rate tariffs - despite better deals being available
- More than 34% of 7,000 energy customers never considered switching
- Dual fuel customers could save an average of £160 a year by switching to a cheaper tariff
- A lack of awareness of deals, "confusing and inaccurate" bills and worries over the difficulty of changing supplier put people off switching
Its plans to encourage customers to switch include:
- Scrapping new rules that restricts suppliers to offering just four tariffs - saying they have in fact ended up reducing competition
- Prompting customers to shop around by using tools such as smart meters
- Introducing a price cap on the most expensive tariffs
Customers have been paying about 5% a year -or £60 - too much for gas and electricity, the Competition and Markets Authority has confirmed.
"Lack of awareness of what deals are available, confusing and inaccurate bills and the real and perceived difficulties of changing suppliers all deter switching - and the higher price levels reflect that suppliers can charge higher prices to these disengaged customers," the CMA said in its report.
Its year-long inquiry into the big six energy suppliers focused on prices between 2009 and 2013.
It outlined plans to encourage customers to switch, but stopped short of recommending a break-up of the energy giants, saying competition in wholesale markets was working well.