LONDON, July 21 (Reuters) - British public borrowing last month was almost a fifth lower than a year earlier, when the economy was feeling the full force of the coronavirus pandemic, but rising inflation put upward pressure on debt costs. Reporting by David Milliken and William Schomberg Editing by Peter Graff You have reached your article limit Register for FREE to continue using Reuters.com Free registration gives you access to: Unmatched, global, round-the-clock news Hand-picked insights that are easy to find and use Our Daily Briefing newsletter, delivering the day"s headlines right to your inbox Register now Already registered? Sign in