The political and financial uncertainty sparked by Britain's referendum on the European Union has seen investors flee to safe havens and savers growing increasingly worried over the impact Brexit will have on their finances.

However, there are still attractive opportunities out there for both categories, provided that one is prepared to shop around a bit. The pound plunged last week, while the Bank of England hinted that, after seven years at a record-low 0.5%, interest rates could soon be cut again, with some economists warning the BoE's rate could hit 0%.

Declining interest rates could prove good news for mortgage holders but the news is unlikely to be as well received from cash savers. According to The Sunday Times, the picture for savers could get even gloomier as experts have already indicated some of the most attractive deals could soon disappear.

As reported by IBTimes UK last week, the average flexible cash ISA rate that savers can currently get is 0.69%. Even the best ISA products out there give little more than 2.75% with quite a few conditions attached, including either restrictions on withdrawals or loss of interest for 180 days if savers take money out before an agreed timeframe.

However, there are still some attractive options in the market. Charter Savings bank offers an interest rate of 1.79% – the highest in the market – for consumers willing to tie up their money for up to 12 months or 1.91% for an additional year.

RCI, meanwhile, offers the best interest rate for three-year accounts, at 2.15%. The French bank also offers the top variable rate deal, at 1.45%.

Meanwhile, mortgage holders who are considering switching from a tracker mortgage to a long-term fixed rate have a wide array of options to choose from. There are now 130 10-year fixed rate mortgages at an average of 3.84%, compared with just eight 10-year fixes at an average rate of 5.43% that were available on the market in 2011.

At 2.84%, the cheapest 10-year fix is from Leeds Building Society. It requires a 35% deposit and has a £1,499 fee.

Investors, meanwhile, face a different landscape. Last week the FTSE 100 recorded its best for eight year, but the FTSE 250, which is more exposed to British companies than its bigger counterpart, fell sharply in the wake of the EU referendum.

With housebuilders and financial stocks prone to be subject to Brexit-induced volatility, the Sunday Telegraph's Questor column points investors towards a relatively low-risk investment in the shape of Gym Group.

Shares in the fitness chain are now 11p above the 195p float price set in November 2015 and with the gym industry enduring a long-lasting boom, the stock looks like an attractive bet. Questor adds that, as a low-cost operator, Gym Group could also benefit from a post-Brexit recession, although it retained its "hold" rating on the stock after highlighting worries over the company's ability to sustain its current level of growth.