We have a register of freelance English and IT tutors and are happy to receive CVs. Please send to firstname.lastname@example.org. However, there is no guarantee of any future work.
There are also a lot of other websites which offer opportunities to work in the voluntary or charity sectors.
If you are looking for work and live in Euston, King’s Cross or Somers Town, for advice try the Somers Town Job Hub or the Employment Advice Service based at West Euston Partnership.