Please advise what is the restrictions on the Holborn underground tube ride?
I also googled a bit, and I think I now understand your question. You mean (to quote AGTraveller)
"Holborn station entrance is closed 7:30am and 10:00am daily, and there is currently no changeover from the Central line to the Piccadilly line at the station during the same hours"?
Not quite correct. Entrance is blocked 07:30-10.00 Monday through to Friday. No changeover from Central to Piccadilly correct.
There were none when I was there a couple of weeks ago. If you mean whether you need to carry your bags up or down stairs, Holborn has about 20 steps that you need to navigate in either direction. This is considerably easier than most stations on the tube. (Did I understand/answer your question?)
Get an answer from Citadines Holborn-Covent Garden London staff and past guests.