High ipv6 latency in UK (routing via zepto-tyo)

ipv6 latency in the UK is normally <10ms but for the last 2-3 days has been around 250-300ms.  Ipv4 seems fine.

Just submitted a latency report which shows me being routed via Tokyo (zepto-tyo)?

https://nextdns.io/diag/cdf9b6d0-4cb9-11ef-9fa6-9d2a087aa2b7

Traceroute for anycast primary IPv6 (2a07:a8c0::)
    1 2a00:23c8:1bc2:df00:aab8:e0ff:fe02:836    0ms   0ms   0ms
    2 2a00:2302::1103:203:5d1    1ms   1ms   0ms
    3                   *     *     *
    4 2a00:2302::1102:100:3b    6ms   6ms   6ms
    5 2a00:2380:3014:9000::22    *     6ms   *
    6 2a00:2380:14::57   40ms  29ms   7ms
    7 2001:7f8:4::2:18c1:1    7ms   7ms   7ms
    8                   *     *     *
    9                   *     *     *
   10                   *     *     *
   11                   *     *     *
   12                   *     *     *
   13                   *     *     *
   14 2401:3cc0:10:50::1:230  209ms 209ms 209ms
   15 2401:3cc0:10:50::1:231  209ms 209ms 209ms
   16 2401:3cc0::4:3ff  229ms 229ms 229ms
   17                   *     *     *
   18 2407:b9c0:f1::11  225ms 229ms 226ms
   19    2a07:a8c0::  225ms 222ms 222ms