[Closed] Postal address for Slater & Gordon?

Was hoping to use them to pursue a claim through Cycling UK, but they've sent me a letter saying they don't intend to help. I want to get back to them to clarify what the circumstances were that the initial call handler recorded and passed on*, but there are no contact details on the letter itself, just the registered office address and a postal return address in Watford.

Anyone help?

*I kind of assumed that a farmer leaving an unmarked, unattended rope across a bridleway at the bottom of a hill after moving stock, with no warning signs, was pretty good grounds to pursue a case, but I may be wrong?