For information as this comes up regularly. Just had to renew, M&S wanted £420 with all the bells and whistles, bikes over £2K no longer covered. Called the AA: £168 for basic cover (no accidental damage etc.), increased to £171 to specify one bike valued at £2.5K, including cover away from home. Other bikes up to £1.5K each covered at home without needing to specify, which works for me. Extra £2.50 for a one-off credit card payment.
Hope that somebody finds that useful. Of course, whether they are any good or not, I fervently hope to not find out.