QUOTE (kunekune @ Mar 12 2008, 10:00 PM)

That kind of tenancy would make a huge difference to many tenants: as a parent of school-age children, I'm no longer in a position to move at will, at any time of year, just because the tenancy has finished and the LL wants to sell/change tenants.
BUT ... there is another massive stumbling block that others haven't mentioned. Suppose the LL has a mortgage on the property, a proper BTL mortgage. The bank is not going to permit a longer tenancy because it means that if LL stops paying, they are still bound by the tenancy and can't repossess the house. I'm surprised even 12 months is possible. Certainly, unless you have a mortgage-free LL, I don't think you - or we - are going to get the security that we need for renting to be a viable long-term option. Relying on pure luck isn't a great alternative.
There is no reason what so ever why you can not agree to long term tenancies and the mortgage argument is nonsense, the 1988 Housing Act gives mortgage companies the right to possession in the event of default regardless and the courts are pretty sharp to oblige. (Ground 2 (a) the mortgagee is entitled to exercise a power of sale conferred on him by the mortgage or by section 101 of the Law of Property Act 1925) there seems to some view on this board that a mortgage needs to be a formal “buy to let” contract which is not true, you can take a regular mortgage and inform the company that you intend to let the property and like any mortgage if you default for more than three months they seek possession regardless of whether you let or are an owner occupier.
However....
If you sign up for the 2,3,4... year tenancy you are legally obliged to pay for the entire period of the tenancy so always include a break clause in the contract, say three/six month notice either way, secondly do not sign up for more than seven years, the protection afforded by the 1985 housing act (repairs and maintenance) cease to apply after seven years.
You are more likely to find such tenancies in rural areas particularly on country estates, big cities/towns tend to favour short term ones not least because the agents much more money renewing leases where as country agents make their money on house sales with letting being a side business to keep their big estate clients happy. Secondly the city/town market is more responsive to economic changes and long term tenancies stop the LL from taking advantage of rapid rent inflation.
Which leads to a second point, first try and agree a fixed price contract for the term, if you can not then agree increases up front, DO NOT agree to increases linked to RPI (retail price index) it is destined to fly off the scale in the next twelve months, if you do agree to variable increase say linked to inflation then agree to an annual cap say no more then 5% per year. Remember 5% year on year becomes nearly 11% in year three, on a £900 month rent that is nearly a £100 more!
The best bet if you can get it is a 24 month fixed price, although in the case of my current contract which is a 24 month its downside if the LL is a loony tune as mine is ;-)