The margin between five-year and two-year fixes has trimmed but a shorter fix remains cheaper.

However, at the end of a two-year fix you will move onto a lender's more expensive standard variable rate, most of which could rise any time and many certainly will when rates go up.

Remortgaging again will mean another set of fees and be warned you may end up coming off a two-year fixed rate as criteria are tightening. Brexit should happen within two years of the end of March 2017, which could create economic uncertainty and limit lender appetite. This is why This is Money prefers five-year fixes.

However, if you think you will move in that period you may face large early repayment charges if your mortgage cannot go with you.

A five-year fix gives the opportunity to lock into a low rate for a longer period and avoid extra fees and higher rates in a relatively short time.

Unless you have a good reason to take a two-year fixed rate, such as needing to move or expecting to have to sell your home, brokers have suggested that five-year fixed rates might be a cheaper long-term bet.

Even if the base rates stays low, if lenders are worried about the effect of Brexit, they are likely to make it harder for borrowers to get a mortgage by making their affordability and income tests harder to pass.

Whatever the right type of mortgage for your circumstances, shopping around and speaking to a good mortgage broker is a wise move.

Best tracker rate mortgages 

Tracking a 0.75 per cent base rate may seem an odd decision when rates are likely to only go up - and you could fix for up to five years at a lower rate - however, there is one big advantage to a good lifetime tracker, flexibility.

A fixed-rate mortgage will almost inevitably carry early repayment charges, meaning you will be limited as to how much you can overpay, or face potentially thousands of pounds in fees if you opt to leave before the initial deal period is up.

You should be able to take a good fixed mortgage with you if you move, as most are portable, but there is no guarantee your new property will be eligible or you may even have a gap between ownership.

A good lifetime tracker has no early repayment charges, you can up sticks whenever you want and that suits some people.

Make sure you stress test yourself against a sharper rise in base rate than is forecast. 

Shorter trackers  

Furness Building Society has a two-year discount of 4.50 per cent - currently 1.29 per cent - with fees of £999 at 60 per cent loan-to-value

Leeds Building Society has a two-year fixed discount rate at a 4.30 per cent discount - currently 1.39 per cent - with fees of £999 at 75 per cent loan-to-value

Watch out for discount rates, as these track a rate set by the lender rather than following the path of the Bank of England base rate.

Most lenders move their internal variable rate in line with the base rate, but they don't have to, meaning you could see your rate rise even if the base rate stays put. 

Can you get a mortgage? 

Banks and building societies have broadly got to grips with the tougher new mortgage rules introduced more than four years ago in April 2014.

But getting a mortgage is tougher than it once was. You will need to get your finances in order and be prepared for the lengthier application process and in-depth affordability interviews getting a mortgage requires nowadays.

Lenders also apply different standards to what they will lend.

Weigh up the above, check the rates here and in our best buy mortgage tables, have a scout around what the best deals look like – and speak to a good independent broker.

There are a couple of things to look out for if you do decide to fix.

You need to check the bumper arrangement fees are worth paying – if you don't have a big mortgage you may be better off with a slightly higher rate and lower fee.

It's also wise to think carefully about whether you expect to move home soon. A good five-year fix should be portable, so you can take it with you.

But your new property will need to be assessed and you might need to borrow extra money, and so your lender could still say no. Getting out of a fixed rate typically requires a hefty hit to the pocket from early repayment charges.

Today's low rates may stick around, they may even inch a little lower, but they may also be swiftly axed.

If you think you'd kick yourself if you miss out on one, then set aside some time to consider what to do.

Mortgage rates and savings rates are part of a complex financial web that draws on official lending costs, ie base rate, money market funding costs, and competition for savers' deposits.

The traditional influence on fixed rate mortgages over the past decade has been swap rates,  the cost of obtaining fixed term funding on the money markets for lenders.

Meanwhile, the traditional influence on tracker rates over the same period has been Libor, the cost of floating rate funding on the money markets.

Banks use savings deposits to back mortgages as well as money market borrowing, while building societies are limited in how much of the latter they can use.  

Typically money market costs tended to move in line with the Bank of England's base rate, with Libor about 0.1 per cent above it and swap rates reflecting what the market thinks interest rates will be over a set period of time, ie two years, five years etc.

The credit crunch put an end to this relationship temporarily, but things then returned almost back to normal.

Generally, a rise in Libor or swap rates will push up mortgage costs and a fall will allow lenders to cut them. 

But mortgage lenders' levels of confidence and their access to funding are equally important to rates. Things were pretty tight here for quite some time after the financial crisis and that kept rates relatively high.

The pick-up in the property market and the economy, along with a healthier outlook for banks and building societies has boosted confidence. Rates are now at exceptionally low levels but mortgages are harder to get than they once were. 

Lending is a long way off the easy credit days of pre-2007 - and rightly so.