David Cleevely, Chairman of CRFS, said:

"The valuation put on some spectrum blocks by Ofcom is large - £2 – £3 billion for the 800MHz block for example. If there is interference, even at the margins, then the alteration in this valuation, albeit small in percentage terms, will amount to a large alteration in cash terms. Potential investors will need to understand the level of interference they will face. Therefore, there will need to be careful measurement of interference so that the regulator and investors understand exactly what is being bought and sold.

800 MHz is already used relatively lightly, and some bands could be used now. An example of that would be north of Glasgow where coverage at 800MHz is very low. A good use for this would be broadband wireless, so helping us build Digital Britain.

However, our experience shows that not all spectrum is clean, especially in dense urban areas. There are indications that even the 800MHz bands might have unauthorised use. Given that more intense use of this spectrum is planned, including the 'white space' between bands, we think further investigation is needed to establish what is, and is not, actually usable."