AliExpress item below £135 - customs fee?

I ordered an electric mop for £131 and the seller contacted me saying I’d be the one taking care of customs fees when item reaches UK. She told me it weighs 4kg (don’t know if that’s of any relevance) The mop is for personal use. Would there me customs fees or is it only above £135 that they charge them? TY

Hi,
Anything posted or couriered to you from another country goes through customs to check it is not banned or restricted and you pay the right tax and ‘duty’ on it.
You’ll be contacted by Royal Mail, Parcelforce or the courier company if you need to pay any VAT, duty or delivery charges (‘handling fees’) to receive your goods.
You will not have to pay anything to the delivery company to receive goods worth less than £135 (the value of the goods, postage, packaging and insurance, any duty you owe) unless they’re gifts over £39 or excise goods (for example, alcohol and tobacco). 
More information is available at:
Tax and customs for goods sent from abroad: Tax and duty
Thank you