Bramble may turn out to be one of the few piggies that have not been able to socialise enough with other guinea pigs and have instead latched onto humans. A few boys can be VERY difficult to find the right friend for! However, there are ways to find out whether that is the case with Bramble without you having to acquire any guinea pigs first.
Thanks for adding your location; that is helping me with discussing options for you.
- Boar dating at a rescue that offers this service: Some of our recommended piggy savvy good standard rescues allow you to set up meetings with likely boars at their rescue under expert supervision, so you come home only with a new mate if there is success, at a minimum risk for you of ending up with an incompatible piggy. There are several recommended rescues in the wider Bristol/Cheltenham area that you could contact. You can find the contact details on our rescue locator on the top bar or one of the rescues may recommend a practised vet they are using for neutering.
https://www.theguineapigforum.co.uk/pages/guinea-pig-rescue-locator/
- Neutering: You need to find an experienced neutering/small animals operating vet to go down this way in order to minimise the risk of mainly post op complications, but it can be a viable alternative for those boars that are very difficult to near impossible to bond. I have one of those myself, and he has had a VERY happy new life as the patriarch of a group of sows for the last 3 1/2 years!
If you want to go down that route, you also need to factor in a full six weeks post op wait until a neutered boar is 100% safe to go with girls. One of Hywel's wives if the surprise baby courtesy of a supposedly safe over 5 weeks post op rescue boar, just to prove that particular point!
Sadly, spayed sows are about as rare as gold dust in this country, as spaying is a much more invasive and risky operation than boar neutering. Spaying is generally only done for medical reasons.
Any sow should ideally live out of sight/spread of pheromones from other boars in order to prevent fights or unrest whenever she comes into season. I would also recommend dating at a rescue as mutual liking/instant acceptance will go a long way towards a happy "marriage".
We also have got a piggy savvy UK vets locator on the top bar:
https://www.theguineapigforum.co.uk/pages/guinea-pig-vet-locator/
Please take your time in researching these options. Bramble is not bored, but he would seemingly like company, even though he is struggling to handle it.