Is there a distance limit on a support bubble?

[Anotherdates]

Anyone know... doesn’t seem clear on gov website

I hope not - ours is 200 miles long (DC1 had just exchanged on a house when lockdown 1 hit).

No. See here:

www.legislation.gov.uk/uksi/2020/1374/schedule/3A

No restriction on distance in relation to permitted movements and linked households (ie. support bubbles)

My support bubble is 100 miles away. I've looked into it and there don't appear to be any restrictions on distance. It says to keep it local "where possible".