Jim wrote:
...for a couple of months (say) what are the long-term implications.
Of course it will be unsightly and could present the mower with an
initial problem when finally getting round to being cut but what
about the long-term implications for the grass itself? Will it
recover if subsequently given its due attention.

thanks for any thoughts

Depends..... if it's a rough/family lawn it will recover. If it's a fine
lawn it will never be the same again without a lot of hard work.

When you cut the long growth do it in stages. 1/3 off leave a few days, 1/3
off leave a few days. Longish normal cut.

pk