I use a Herbie's Way Excellent II Deluxe mat on my 401 - it was quite an improvement vs. the stock Garrard mat. Also, I tried a clamp, but preferred the sound without one. Good luck...
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I tried the Herbies Way Excellent, the Thornes Mat, SDS Isoplat Mat, the Millennium Mat, and the Boston Audio Mat 1.
In your system I would start with the Boston Mat, I think it would be a very good match, and a great start.
Your Harbeth speakers and system have a similar tonal balance to my system and speakers which are ATC. The Boston was the clear match for MY system.