Can a bailiff leave a Notice of Enforcement with a neighbour?

No

The enforcement agent must give the debtor a Notice of Enforcement^[1] addressed to the debtor where he lives,^[2] or to him personally.^[3]

^{[1] Paragraph 7 of Schedule to the Tribunals, Courts and Enforcement Act 2007
[2] Regulation 8(1)(a) of the The Taking Control of Goods Regulations 2013
[3] Regulation 8(1)(e) of the The Taking Control of Goods Regulations 2013}