The government is carrying out a wide ranging review of local authorities statutory duties. One of these duties is to provide land for the use of allotments, if there is sufficient call from local people.
As we all know some local authorities have a very unique way of interpreting their obligations to people, so the removal of any law that demands they should provide adequate provision of land for allotments can only be seen as a step in the wrong direction.
The National Society of Allotment & Lesure Gardeners have posted an extract from the Small Holdings and Allotments Act 1908 Section 23, which this government review could affect. Have a look at their site and if you feel so moved you should make your views known to the authorities - you don't have long!