Central Government funding for ESL/AL
The Section 11 Grant - 1966
Funds were made available to local authorities with high proportion of commonwealth immigrants in 1966 under section 11 of the Local Government Act:
(1) Subject to the provisions of this section the Secretary of State may pay, to local authorities who in his opinion are required to make special provision in the exercise of any of their functions in consequence of the presence within their areas of substantial numbers of immigrants from the Commonwealth whose language or customs differ from those of the community, grants of such amounts as he may with the consent of the Treasury determine on account of expenditure of such descriptions (being expenditure in respect of the employment of staff) as he may so determine.
(2) No grant shall be paid under this section in respect of expenditure incurred before 1st April 1967.”(Chapter 42 of the local government act, 1966)
In September 1993, the rule that funding could only be allocated to those from the New Commonwealth was removed 
EMAG Funding - 1999
After years of criticism, an alternative to the Section 11 funding was proposed in 1999 which was called EMAG. EMAG is the Ethnic Minorities’ Achievement Grant. 85% of EMAG had to be devolved to schools, with local authorities holding a maximum of 15% of the funding.
“General” Funding - 2012
In 2012 this funding was stopped and was taken over by Michael Gove’s “fairer schools funding system” which focussed on ensuring that every EAL pupil attracted funding for the first 3 years of their education in the UK. The minimum levels, per pupil, are set each year by the Department for education.
This was included in the overall funding of the school each year, and it's not a special fund or grant. It is designed to help schools with additional educational needs that come with educating pupils who have English as an alternative language.
The minimum level of this funding as of 2015/2016 academic year is set at: £466 per primary aged pupil and £1130 per secondary aged pupil. 
In the most recent review in to schools funding, 45% of schools believed that this level of funding was adequate, 16% disagreed that it was adequate and 39% weren’t quite sure.