I need help

Currently I offer free shipping for all orders over a certain amount (£25), but Im needing to exclude certain products (My candle warmers page, because shipping is included in the price of the items).

I drop ship the candle warmers etc products not from my home.

So if a customer buys 6 wax melts which isn’t over £25.00 this means the postage for royal mail needs to kick in £2.68 (I post the melts myself) and if they buy a warmer too, the system auto selects free shipping because the warmers are above £25.00
ill be out of pocket. xx
I need help to exclude the warmers from the free shipping over £25 rule xx
xxxx Can anyone help me
Thank you xx

The page I need help with: [log in to see the link]