There's a HH event at St Alban's on 19th December.
Places currently available on SIentries. They have a short blue at 5.8km and a green at 3.7km. This is mostly parkland so unlikely to be any TD5 legs so most TD3/4. Parking can be tight so you might have to park in the streets.
A request please share any knowledge of available entries. There are few events out there and they tend to sell fast.