If you both want to work, even for a short stay of 8 months, then your husband is going to need either a work permit or one of the spouse visas. Those are the only options.
If an employer is willing to sponsor him in the US, then the employer handles the vast majority of the visa paperwork. Your husband will then be called to the Embassy only when he needs to apply.
Otherwise, there are three routes for obtaining a spousal visa to the US. The easiest is called Direct Consular Filing, in which you, as the US spouse, prepare the petition to apply (the I-130) packet and send it directly to the Embassy in London. When the petition is approved, then your husband is notified of what paperwork he needs to gather and given a date to appear at the Embassy, where he'll make his actual application. This route results in either a CR-1 or an IR-1 visa (CR-1 if you're married less than two years and IR-1 if you've been married longer); it is much like the green card and visa rolled into one. He can work right away and a green card is mailed to his US address after he enters the country.
You can also apply for a CR-1/IR-1 stateside, though why you'd want to do this is beyond me as it just increases the length of time of the processing. The last route is you can apply for the K-3 visa, but this is gently being phased out, takes a long time and while it allows multiple entries into the US, it does not allow work -- your husband would have to move to the US and file for adjustment of status once he got there to obtain a green card. In most cases, the K-3 is administratively closed and USCIS continues on issuing an IR-1/CR-1.