https://inews.co.uk/news/tanks-uk-how-many-row-germany-leopard-2-ukraine-explained-2101602

How many tanks does the UK have?

As of 1 April, 2020, ]the UK Armed Forces had more than 4,000 armoured vehicles in total, the bulk of which are used for transportation.

The Russian army has lost more tanks in Ukraine than Britain has armoured vehicles to begin with.