im on the other side as I work for a church and see them when they go wrong.
top tips:
check what happens if you move house, specifically area, can the policy be easily transferred to a nearby funeral director, what are the costs if any?
what does the plan actually include, typically it includes a basic coffin, professional services of the funeral director, hearse, cremation fees and the basic chapel cost - they may not include other cars, flowers, reception, church etc so if these are things you want check that small print.
timings - I’ve heard horror stories of the plan only being valid off peak (Tuesday to Thursday), and worse there being a supplementary cost for services from 11.30-2.30pm, again check carefully.
finally most “chains” are actually franchises hence the transfer question, and may vary around the country, get local recommendation, eg my local coop used to be terrible from my perspective but new management is in place and now are excellent!
i suppose what I’m saying is read all that small print and don’t be pressured to sign without shopping around