Yes it most probably is.!!!!!
They are really good if you want another test quickly, my own experience was I couldn’t get a test for another 3 months After I failed my 1st one and this was pre Covid !! it’s always really booked up.
I joined cancellations 4 all and within 2days got an earlier test - 3 weeks after my failed one.
Luckily I passed 2nd time - my view is it’s worth the extra money (at the time it was £18)
But compared to the amount of driving lessons I would have had to fork out for it was worth it.
Go for the one that automatically books for u - you give them days times when available and they will book it for u
Good Luck