Data handling and processing is a necessary part of club administration, so it is logical that it is a condition of membership that the putative member allows the club to hold and process the minimal amount of data necessary to do the job. If the putative member cannot agree to that condition, then they obviously cannot be a member. Is that what you mean by 'consent'?
Not quite. You can stop at necessary. No one has or should be asked to agree to or allow having their information processed for club membership administration. It shouldn’t therefore be bundled with any conditions. If you want to be a member, you have to give the club xyz information.They don’t have a free, without detriment choice, so giving a choice, or the illusion of one is inappropriate.Take the Inland Revenue, for instance. They don’t ask for your permission to process your information because they don’t need to.
Some information may be optional and this is fine. For example, if you want to receive a hard copy newsletter, provide your address (and your address will only be used for that purpose).Insisting on holding everyone’s address for a small minority who choose a hard copy would be a problem. Imagine a club membership list gets left in the pub at a committee meeting. If you wanted to know which sheds or garages to target as a crook, it would be a very useful starting point.
What is collected and how it is minimised, used, secured, kept up to date etc. must comply with the seven data protection principles which is important to ensure the club operates lawfully and the members have confidence. Having an appropriate lawful basis before you start (consent, contractual necessity etc) is one part of one of the seven principles.