Withdrawing CAS & Accepted Unconditional Offer Letter to Other Uni

Is this a postgraduate course?

Yes you can apply for UCL CAS. At the same time you can write LSHTM to withdraw the CAS. It is not ethical to hold more than one CAS. You should be transparent in all the steps.

This thread is 5 months old so all resolved now.

Why is it ethical to hold multiple offers but not to be issued with multiple CAS's?

I think holding multiple CAS at a time may restrict the university to enroll another student in place of you. In every university, number of student is fixed. so if a person holds 3 CASs (say) from three different universities at a time, then probably two potential students will be deprived to get admitted to the universities. In that point of view, if some one decide not to enroll into the programme after receiving CAS, he/she should immediately inform the university to withdraw the CAS.

I think holding multiple CAS at a time may restrict the university to enroll another student in place of you. In every university, number of student is fixed. so if a person holds 3 CASs (say) from three different universities at a time, then probably two potential students will be deprived to get admitted to the universities. In that point of view, if some one decide not to enroll into the programme after receiving CAS, he/she should immediately inform the university to withdraw the CAS.