The long-expected credit crunch linked to massive failure in the American sub-prime market really hit home yesterday.

The European Central Bank, regulator of the Eurozone group of countries, piled into the markets with $130 billion of cheap, emergency credit.

The move, the biggest central bank intervention since 9/11, came after reports that commercial lenders were desperately hauling back the supply of loans. The French giant BNP Paribas suspended withdrawals from three of its investment funds because of their exposure to the U.S. sub-prime market, saying “There has been a complete evaporation of liquidity” from credit markets, which could escalate into a worldwide credit squeeze.

Rumours were rife of impending fund meltdowns and banking collapses. Trevor Williams of Lloyds TSB said, “Liquidity has dried up basically. It’s a moment of panic.”

Nick Sparks, risk manager at F&C Partners, said, “People have got caught out. There will be more pain to come.”

You have been warned.

In the UK, buy-to-let property has been a top target for many investors, big and small. Many people are entering the thriving market as a substitute for pensions.

Now, it seems, the prospects are not so good, as interest rates rise, putting pressure on borrowers, and house prices start to fall. Worse, landlords will be hit harder than the lenders in the prevailing conditions.

Indicative of this, the share price of Paragon, Britain’s biggest buy-to-let lender, has fallen 20 percent this year. This is despite the firm being the most conservative mortgage lender in the sector. Only 0.15 percent of its lending book is in arrears, compared with 0.64 percent across the buy-to-let market, and 0.89 percent in the mortgage sector as a whole.

The company asserts, however, that landlords generate 125 percent of their mortage costs, giving Paragon some protection from a downturn. Similarly, it makes 90 percent of its money from its backbook, so plummeting mortgage applications won’t hit it very hard.

Paragon shares might just be a good buy, despite the state of the market. Whether landlords with their pensions tied up in property will see it that way, remains to be seen. Play it long, is good advice here.

Researchers at MoneySupermarket.com have unearthed 110 charges and fees on basic financial transactions that customers may be liable for.

In the UK, penalties hidden in the small print can add up to more than £8 billion ($16 bn) in revenues for finance companies, credit cards and banks. And a similar situation may also exist in the USA.

The website looked at five common financial products : current accounts, mortgages, loans, credit cards and savings.

Mortgages, with arrangement, booking and valuation fees accounted for 46 of the total. These have risen to around £1000 ($2000) in the past year.

Normal bank accounts can levy 32 penalty charges, while credit cards account for 16 fees. Loans attract up to 11 charges.

Stuart Glendinning, Managing Director of the website, said : “It is unbelievable that five financial products can be the root of so much penalty pain.”

Nick Gardner, a director at Chase de Vere, the mortgage advisers, said the range of fees embedded in home loans is “cunning and completely unacceptable. The headline rates may be coming down, but the number and scale of fees have risen enormously.”

Maybe it’s time to get that old magnifying glass down from the attic.

If you have a poor credit record, low earnings or have recently moved to another country, you may be classed as “sub-prime” by lenders if you apply for a loan or a mortgage.

There’s no escaping this Mark of Cain even if the only flaw in your situation is that you have recently taken a new job or become self-employed.

Banks and mutual lenders treat sub-primes in a straightforward fashion — with high interest rates. Indeed, the unfortunate sub-prime will often have to approach a specialist lender to negotiate their loan.

The recent falls in stock markets around the world were partly caused by a rise in sub-prime defaults in the U.S. following 17 rate hikes in two years. Many had taken out second mortgages to pay off other debts and were unable to meet repayments.

However, these cases should be set in perspective against a background of very low levels of mortage default in both the U.S and the UK.

If you think you may be assessed as sub-prime, try going to standard lenders first and explaining any mitigating factors. For example, that new job may represent a substantial increase in salary.

Should you be knocked back by the big boys despite the good news, the bad news is that you may have to bite the bullet and pay more than the average to get a mortgage.

Once the conditions that make you sub-prime have been relieved, however, you should remortgage at normal rates as quickly as you can.