www.cpc.co.uk do heatshrink & adhesive lined, including 4:1 shrink.

Shortest length is 1.2m, if you just need a small piece indicate
a) what size o.d. you need to fit over things and b) end size o.d.

Where o.d. is overall diameter. I may have the right size free.

Noted adhesive lined will not be flexible once shrunk, it will
be rigid and can force cables to break. If the cable is not moved
much this is not really important - if it is, layer non heatshrink.
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DB.