Peter Nikitin, Neil Joiner and myself all have our accommodation organised.
Last year we had a late entry fee after Dec 1st. Most entries were in by then but not all. Hardly any entered before mid-November. So T-shirts ordering is always an art - even if you can leave it till December.
An online entry form with the Nationals info on the NMCC site (enter now, pay later) is probably your best bet.