I read a wonderful piece once, on gift giving. In reality we buy gifts we would like to receive, that reflect our own personal taste.
It makes me abit odd - but I do not want someone else buying me things for my house. I wish to choose and furnish it myself. I have my own taste. EG the current trend for silver, mirrored and glittered stuff, it is just awful. It's tacky, cheap and looks like it came from a fairground stall. So any photo frames like that would be straight to the charity shop.
Money really is the most appropriate gift; the coupl can then choose what they would like, they can pool money for larger items. TBH I'd rather they spent is on a brilliant honeymoon (twee) making memories than stuff hanging round to dust.
It is polite, where ever you go, to take a gift, so yes you do cover your plate in the same way, if you went to a dinner party you would take apprpriate wine/flowers/chocolates for yoru host/ess, ditto the evening do. If you are going to get pissed up at the bar, trough the buffet and strut your funky stuff to the disco, then you take a gift.
According to this, that average monetary gift per head is £60
www.thelondoneconomic.com/lifestyle/top-10-wedding-gift-rules-you-should-know/06/08/
This however states E150 per head
www.youandyourwedding.co.uk/forum/the-wedding-budget/are-money-gifts-acceptable-how-do-you-ask-how-much-on-average/439200.html
Average spend on a gift is £50
[[https://www.telegraph.co.uk/health-fitness/mind/ultimate-wedding-gift-guide/
1 in 5 ignore the gift list and 97% buy the cheapest item on the list