1949 places left. Let's see how many places go tomorrow.
Never mind tomorrow: for those who'd ridden a 600 pre-qualifier, about 1100 went in the first hour of 29 Jan (282300-282359 GMT) and another 1000 in the next 23
1/2 hours (ie "tomorow").
2259 - Fingers on buttons 400 peeps.
1) Having set up account
2) Knowing (written on paper) your (2018) 400km BRM ACP homolgation number
3) Having a Paypal account set up
4) Be logged in to account
5) Once pre-registration made, note entry number (in form PBP-5432) before going to pay (needed for reference in pay page - does not auto-populate)
Once all done you'll likely be able to go back in and select a different start time (where there are spaces) until ACP 'validate' your pre-inscription, lock start time choice and send you an e-mail (for me that was two days later).
HTH