After the transfer, Legal & General will continue to collect the Ongoing Advice Charge from the Bond, just like they do now, but it will be paid to Origen Financial Services Limited, rather than Nationwide Building Society.
Once the transfer takes place, HMRC may require VAT to be applied at 20% (there’s no VAT added at the moment). If this is the case, Origen will confirm this with you, and you will then see an increase in the Ongoing Advice Charge.