Which one should I get? You can select a few then it can be narrowed down. There are a handful of links.
Tea tree:
Botanics Aromatherapy Pure Essential Tea Tree Oil - 10ml - http://www.boots.com/en/Botanics-Aromatherapy-Pure-Essential-Tea-Tree-Oil-10ml_10723/
Nelsons Tea Tree Cream - 50g - http://www.boots.com/en/Nelsons-Tea-Tree-Cream-50g_923936/
Thursday Plantation Tea Tree Oil - 10ml - http://www.boots.com/en/Thursday-Plantation-Tea-Tree-Oil-10ml_537978/
TEA TREE PURE TEA TREE OIL 10ML - http://www.superdrug.com/First-Aid/TEA-TREE-PURE-TEA-TREE-OIL-10ML/invt/657593&bklist=
SUPERDRUG TEA TREE BLENDED OIL 10ML - http://www.superdrug.com/Tea-Tree/SUPERDRUG-TEA-TREE-BLENDED-OIL-10ML/invt/167126&bklist=
SUPERDRUG TEA TREE 100% ESSENTIAL OIL 5ML - http://www.superdrug.com/Treatment/SUPERDRUG-TEA-TREE-100-ESSENTIAL-OIL-5ML/invt/81191&bklist=
Dr Organic - Tea Tree Pure Oil - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1684&prodid=1805
Dr Organic - Tea Tree Blemish Stick - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1693&prodid=1804
Holland & Barrett - 100% Pure Tea Tree Oil - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=272&prodid=341
Perfectly Pure - Tea Tree Pure Essential Oil - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=286&prodid=533
Herbal Authority - Tea Tree Oil Lotion - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=553&prodid=595
Australian Tea Tree - Tea Tree Oil - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1262&prodid=1527
A. Nelson and Co - Tea Tree Cream Antiseptic - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=945&prodid=1123
With Hazel:
Boots Distilled Witch Hazel B.P.C - 200ml - http://www.boots.com/en/Boots-Distilled-Witch-Hazel-B.P.C-200ml_2245/
Boots Witch Hazel Gel - 35ml - http://www.boots.com/en/Boots-Witch-Hazel-Gel-35ml_865590/
WITCH HAZEL STICK 10G - http://www.superdrug.com/Problem-Skin/WITCH-HAZEL-STICK-10G/invt/678631&bklist=
WITCH CLEAN AWAY CLEANSER 150ML - http://www.superdrug.com/Problem-Skin/WITCH-CLEAN-AWAY-CLEANSER-150ML/invt/29262&bklist=
WITCH DOCTOR GEL 35G - http://www.superdrug.com/First-Aid/WITCH-DOCTOR-GEL-35G/invt/69732&bklist=
Aloe Vera:
Banana Boat Aloe Vera Gel 453g - http://www.boots.com/en/Banana-Boat-Aloe-Vera-Gel-453g_2625/
Durex Play aloe vera lubricant - 50ml - http://www.boots.com/en/Durex-Play-aloe-vera-lubricant-50ml_981258/
Lifeplan Aloe Vera Juice - 1000ml - http://www.boots.com/en/Lifeplan-Aloe-Vera-Juice-1000ml_1037166/
Aloe Pura - Aloe Vera Lotion - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=680&prodid=721
Holland & Barrett - Aloe Vera Gel Pump Bio Active Skin Treatment - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=850&prodid=913
Holland & Barrett - Aloe Vera Gel - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=515&prodid=298
Holland & Barrett - Aloe Vera Colon Cleanse (330mg) - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=653&prodid=754
Aloe Pura - Organic Aloe Vera Gel With Tea Tree - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1289&prodid=1537
Aloe Pura - Organic Aloe Vera Gel With Vitamins A C E - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1290&prodid=1534
Dr Organic - Aloe Vera Gel - http://www.hollandandbarrett.com/pages/product_detail.asp?pid=1631&prodid=1752