There will soon be three drydocks for SSNs/SSBNs in Devonport. 10 dock is scheduled to be available from 2027, I believe, and will be usable for both As and Vs, 15 dock had to be upgraded after the last T before Audacious could dock for a BMP, there was a delay as the workforce was concentrated on 9 dock as getting that ready for Victorious unsurprisingly had higher priority - necessary due to problems in Faslane. Given the delays in the past 2028 may be more realistic.