Anagrams for names are very fiendish indeed.
My only suggestion: Two of the groups are premiership football related; maybe try to mix topics around.

anagrams are not fiendish - they are ridiculous, especially when you look at the obscure footballers as well - utter shite - avoid at all cost!!
in fact most of the connections are poorly manufactured.
Sorry - you are trying too hard and failing

I liked the cars. The football grounds were do-able though I only got a couple. The anagrams were too specialist in my opinion and you would do better to ease off a bit and be more accessible. That said it is a pretty decent grid.

Like to see someone trying to make grids tricky but perhaps a bit convoluted this time esp Prem captains which is very niche

Must concur with the below. Puzz to the max, but two of these groups a proper stretch. Keep it up though, one of the puzzest grids around.

Perhaps too sporty and dated (anagrams of team captains from a particular year?)