How do you estimate a market value of debt? (UK companies)

I've trying to follow Damodaran's instructions on estimating a market value of debt:

"The market value of debt is usually more difficult to obtain directly, since very few firms have all their debt in the form of bonds outstanding trading in the market. Many firms have non-traded debt, such as bank debt, which is specified in book value terms but not market value terms. A simple way to convert book value debt into market value debt is to treat the entire debt on the books as one coupon bond, with a coupon set equal to the interest expenses on all the debt and the maturity set equal to the face-value weighted average maturity of the debt, and then to value this coupon bond at the current cost of debt for the company. Thus, the market value of $1 billion in debt, with interest expenses of $60 million and a maturity of 6 years, when the current cost of debt is 7.5% can be estimated as follows:
Estimated Market Value of Debt = million
If you want a more precise estimate, you can estimate the market value of each debt issue separately and adding them all up at the end."

However, I can't determine face-value weighted average maturity of the debt, as there is no information on interest payables by year; which is used in this Practice Webcast: . In addition, I am not certain as to what "interest expenses on all the debt" entails? Does this refer to Interest on Long-Term Debt in Income Statement.

I'm very new to this topic so forgive me for trivial questions. I am trying to calculate beta of a private company using The Bottom-Up approach, and it's been emphasises in various books the importance of using market value of equity and market value of debt. I have no difficulty in finding market value of equity, but don't seem to be able to find comprehensive information on retrieving market value of debt on the Internet.