If your child has not been formally excluded and school has not given you a letter to say this then perhaps you should tell them you will be bringing him in as usual and going back to work
I agree make it absolutely clear you are not taking responsibility for your son during the day as you have to work (and he is not ill). The LA will either have to offer education placement as emergency, PRU or provide sitter (via social care) and work to do at home, or could for eg let him continue attending his current school with 2:1 out of class etc while they find a suitable placement. Too often they expect parents to just quit work and take the child home
Ring the indep school Monday and ask if they have a place / can do an assessment
Tell the LA firmly having him home for more than a day or two is not an option and you want an emergency placement and you can suggest the indep placement. An emergency placement should trigger a reassessment of the statement but he can go to a SS while the reassessment is taking place. Follow up in writing so you have an audit trail of how long it is all taking.
Quote the SENCOP if necessary to show you know your rights.
See SEN Code of Practice:
Assessment and emergency placements
8:23 In exceptional cases it may be necessary to make an emergency placement for a child,
for example where:
a the child?s medical circumstances have changed suddenly, causing a rapid and serious deterioration in the child?s health or development
b the parents, school, relevant professionals and the LEA agree that a sudden and serious deterioration in the child?s behaviour make the child?s current placement untenable or unsafe
c where a child arriving unexpectedly in the LEA exhibits such significant learning difficulties as would normally warrant a statement; the LEA should consult the parents and those immediately concerned, including the previous LEA, about the most appropriate placement
d where a young person returns home from a secure unit or young offender institution.
8:24 An emergency placement should only be made when the LEA, parents, school and relevant professionals are all agreed that the child?s needs are such that action must be taken immediately and an emergency placement is the best way forward.
8:25 When an emergency placement is made, the LEA should immediately initiate a statutory assessment or reassessment. It is likely that the assessment will conclude that a statement should be made, or amendments made to an existing statement. If the child has been placed and will remain in a special school, a statement should always be made. The circumstances in which a child without a statement can be placed in a special school are discussed at 7:30 ? 33.
8:26 If, however, the assessment concludes that a statement is not necessary, the child?s emergency placement should be reconsidered. Decisions about how the child?s needs should be best met in the longer term should not be prejudiced by the nature of the emergency placement. If a child without a statement has been placed in a special school for an assessment but it is decided that no statement is necessary, the child can only remain in the school for 10 school days after the LEA has notified the parent that they do not intend to make a statement.
8:27 Statements drawn up or amended following an emergency placement should include detailed objectives with clearly specified review arrangements to monitor the efficacy of the provision made for the child. Whilst the LEA has a duty to review the statement on an annual basis, they may wish to use their powers to review more frequently and to ask for interim reports on the child?s progress.
8:28 Where a social services department makes an emergency placement out of their own budget for a child with a statement of SEN, they should immediately inform the LEA, especially where the placement is in an independent school.